Локальная физика фазовых переходов без параметра порядка/ Local Physics of Phase Transitions without an Order Parameter тема диссертации и автореферата по ВАК РФ 00.00.00, кандидат наук Марков Антон Александрович
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- Количество страниц 151
Оглавление диссертации кандидат наук Марков Антон Александрович
Contents
1 Introduction
1.1 Phases without an Order Parameter
1.2 Thesis Structure and Content
1.3 Dissertation Goals
1.4 Statements to Defend
1.5 Theoretical and Practical Significance
1.6 List of Publications
1.7 Validity and Methods
1.8 Validation of the Thesis
1.9 Personal contribution of the author
2 Phase Transitions Without an Order Parameter
2.1 Mott-Hubbard physics
2.1.1 HubbardModel
2.1.2 Metallic Phase. Weak Coupling
2.1.3 Mott insulator. Strong coupling
2.1.4 Numerical Approaches to the Hubbard Model
2.1.5 Experimental Signatures of the Mott Transition. The Case of Study:VO2
2.2 Topological Phase Transitions
2.2.1 Topology and Condensed Matter
2.2.2 Quantum Hall Effect and Topology
2.2.3 Twisted Boundary Conditions and Many-Body Chern Number
2.2.4 Single-particle Greens Functions and Topology
2.2.5 Chern-Simons Action and the Streda Formula
2.2.6 Chern Insulators: Materials and Experiments
2.2.7 Local Topological Markers for Chern Insulators
2.3 Dynamical Quantum Phase Transitions
2.3.1 Lieb-Robinson Bounds
2.3.2 Dynamical Quantum Phase Transitions
3 Hofstadter-Hubbard Physics
3.1 Hofstadter-Hubbard Model and DMFT Approximation
3.2 Effect of Finite Interactions and Temperatures on the Lattice Quantum Hall Effect
3.2.1 The Hall Conductivity at Finite Temperatures
3.2.2 Numerical Results
3.2.3 Importance of Correlations
3.3 Orbital Magnetization on the Edge of the Mott Transition
3.3.1 Orbital Magnetization in Insulators
3.3.2 Orbital Magnetization in Hofstadter-Hubbard Model
3.3.3 Numerical Results
3.3.4 Strong-Coupling Expansion
3.3.5 Band and Mott Insulators
3.4 Orbital Magnetic Field Driven Metal-Insulator Transition
3.4.1 Results
3.4.2 Discussion
3.4.3 Relation to Experimental Studies
4 Local Markers for Phase Transitions Without an Order Parameter
4.1 Local Marker for Interacting Topological Insulators
4.2 Numerical Results
4.3 Locality of Topological Dynamics in Chern Insulators
4.3.1 Topological Markers Out of Equilibrium
4.3.2 Chern insulators and their Local Topological Markers
4.3.3 Topological Markers' Dynamics
4.3.4 Local Chern Marker
4.3.5 Local Streda Formula
4.3.6 Quench Dynamics
4.3.7 Translationally Invariant Bulk. QWZ model
4.3.8 Hofstadter-Harper Model
4.3.9 Non-local Transport of the Marker
4.3.10 Slow markers' dynamics
4.3.11 Experimental Relevance of the Results
4.4 Dynamical Quantum Phase Transition Without An Order Parameter
4.4.1 System and Method
4.4.2 Main Results
4.4.3 Low Energy Excitations and Fisher Zeros
4.4.4 Weak Disorder and DQPT
4.4.5 Proof of the Theorem
4.4.6 Application of Theorem 1 to Harmonic Perturbation
4.4.7 Influence of Disorder on the Fermionic Correlators
Appendices
4.A Locality of Topological Dynamics
4.A.1 Local Streda Marker in Equilibrium
4.A.2 Local Streda Marker out of Equilibrium
4.A.3 Spectral Power of the Markers Currents
4.A.4 The Effect of Disorder on the Dynamics
4.A.5 On the Gauge Invariance of the Local Chern Marker Currents
4.A.6 M currents
4.B DQPT without an Order Paramter
4.B.1 Shape of BCS-matrix G without Disorder
4.B.2 Asymptotics of Commutator Series
4.B.3 Bounds on Change of Fermionic Correlators
4.B.4 Fermions in Energy Basis
4.B.5 Fermions in the Position Basis
4.B.6 Finite Disorder
4.B.7 Perturbations of Different Wavelength
4.B.8 Low Energy Part of BCS-matrix, Numerical Test
5 Conclusions
5.1 Hubbard-Hofstadter physics
5.2 Local Markers for Phase Transitions Without an Order Parameter
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Введение диссертации (часть автореферата) на тему «Локальная физика фазовых переходов без параметра порядка/ Local Physics of Phase Transitions without an Order Parameter»
Chapter 1 Introduction
1.1 Phases without an Order Parameter
The concept of a phase is natural when the physics of many-body systems, with their enormous number of degrees of freedom, is considered. Most generally, the definition of a phase can be boiled down to: a class of states of a many-body system with qualitatively distinct behavior in their observables and correlators. Fixing a phase, rather than a state, allows one to describe a whole N-body quantum system with a few parameters and a few characteristics, whereas an exponentially large (in N) number of parameters is required to fix a state. For many centuries, three phases of matter were known. These are solid, liquid, and gas, described by only three parameters: temperature, volume, and pressure. In the 20th century, it was realized that there are many more phases of matter. This required a more constructive definition of a phase and classification schemes for the phases themselves. There are three main approaches aimed at defining and classifying the equilibrium phases of matter. The first classifies the phases by their symmetries, the second by the low-energy effective theories, and the last by the topological properties. These three approaches are illustrated schematically in Fig (1.1).
Figure 1.1. Schematic illustration of a phase diagram from the perspectives of (a) Landau theory, (b) Renormalization Group, (c) Topological classification.
Landau [1] proposed the first scheme to classify different phases. According to his theory, phases are uniquely characterized by their symmetries. During a phase transition, the symmetry of a state changes, leading to qualitatively different physics. For example, a solid breaks the
translational invariance of a liquid, and a ferromagnet breaks the spin-rotational symmetry of a paramagnet. This process of symmetry breaking can be described by an order parameter. In the simplest cases, such an order parameter is just one real number, r In a disordered phase, symmetry is preserved on average, and the order parameter is zero, while in an ordered phase, the symmetry is broken, and it acquires a non-zero value. In an infinite homogeneous system, a single global order parameter r suffices. However, to address phenomena in inhomogeneous systems, where different parts may be in different phases, it is not sufficient. In 1950, Ginzburg and Landau [2] introduced a spatially dependent local order parameter r(x) to describe the surface tension at the boundary between a superconductor and a normal (non-superconducting) state, as well as the destruction of the superconducting phase by a magnetic field.
One of the most important counterexamples to this classification scheme is the Kondo problem [3]. The physics of metals with a small number of magnetic impurities is very different at low and high temperatures; however, no phase transition is observed between these states, and no symmetry is broken. The first part of the Kondo problem was revealed experimentally in 1930 [4], predating the inception of Landau theory. W. Meissner and G. Voigt found that metals (presumed pure) exhibited resistance minima at non-zero temperatures, while a decrease in resistivity at low temperatures was expected. In a series of experiments [5,6], this effect was observed in the presence of impurities with partially filled d-levels close to the Fermi energy of a host metal. The second puzzle constituting the Kondo problem was the formation of local moments on magnetic impurities embedded in a metal. Matthias 1 and collaborators [7] observed that a small fraction (« 1%) of Fe immersed in transition metals and their alloys either forms or does not form localized magnetic moments. In a further experiment [8] at Bell Laboratories, these two phenomena—anomalous low-temperature resistance and the formation of local moments—were connected. The modern view of the Kondo problem is that the low- and high-temperature physics of magnetic impurities in metals is described by very different effective low-energy theories. A "poor man's version" of this idea is due to Anderson [9]. A more systematic and rigorous way to construct these low-energy theories came with the development of the Renormalization Group (RG) [10,11].
The main idea of the RG, in its various incarnations [10,12-14], is that the low-energy, longdistance physics should not depend on the microscopic high-energy details. Consider a microscopic theory with a set of couplings {J} describing interactions between the system's constituents. Under RG, the high-energy degrees of freedom are successively eliminated, leading to a change (or flow) in the couplings {J}. At some point (perhaps only in the sense of a limit), the couplings no longer change, and a fixed point is obtained, with a new set of parameters {J}. It turns out that most of the couplings among {J} flow to zero; such couplings are called irrelevant. Thus, often the low-energy theory is much simpler than the original microscopic one. Different phases of matter correspond to basins of attraction around fixed points, which are themselves stable with respect to the RG procedure. Unstable fixed points form critical surfaces separating such basins and correspond to phase transitions. When applied to the Kondo problem, RG shows that the coupling between a magnetic moment and the conducting electrons is an example of a relevant coupling; that is, it flows to infinity at low energies. Thus, at high temperatures, we deal with weakly interacting, high-energy physics. However, lowering the temperature, we instead probe the low-energy physics of the system, which is strongly coupled.
The relevance of topology to the classification of phases beyond the symmetry-breaking paradigm began to be appreciated in the 1960s-70s. Perhaps the first example of a topological phase transition was provided by Lifshitz in 1960 [15]. He noticed that a change in the topology
:The same Matthias as in "Matthias rules". These are famous empirical rules for identifying superconductors. The last rule advises experimentalists to "Stay away from theorists!".
of a Fermi surface drastically alters the density of states and, thus, thermodynamic quantities. He further argued that, in general, no symmetry has to be broken during such a process. The next key insight came from Berezinskii [16] in 1971. He showed that correlators of the two-dimensional XY-model obey different asymptotic forms in the low- and high-temperature limits. According to the Mermin-Wagner theorem [17], however, a continuous symmetry cannot be broken in two-dimensional systems; therefore, no phase transition was expected in the model. Berezinskii connected the behavior of long-range correlators to the possibility of the vector order parameter of the XY model making several full revolutions along the path between two points.
A similar result was independently obtained by Kosterlitz and Thouless [18,19]. They provided a much simpler and more intuitive picture for the phase transition, connecting the revolution of the order parameter with the existence of topological excitations in the system. These are vortices and anti-vortices. At low temperatures, there are no such excitations, but at higher temperatures, the entropy gain allows the formation of vortex-anti-vortex pairs, which can separate and behave as independent excitations. This line of thought was later systematized in a homotopy theory of topological defects by Thouless and Kleman [20], as well as independently by Volovik and Mineev [21] and Rogula [22] in 1976.
However, the field of topological phase transitions truly bloomed with the discovery of the
Quantum Hall Effect [23]. The Hall conductivity was observed to exhibit an astonishingly precise
2 2
quantization in units of , despite 2 the presence of a significant number of impurities. Thouless and collaborators explained [24] that this precision could be understood using topological arguments. They provided the connection between the Hall conductivity and a topological invariant of the corresponding single-particle Hamiltonian. Since then, the idea that different phases can be classified by topological invariants, rather than symmetries, has spread across the entire condensed matter community. Several definitions of a topological phase have been proposed, each slightly different yet intertwined. The key idea is to define a set of continuous deformations of Hamiltonians, field configurations, or wave-functions. Then, phases can be classified by the properties of such objects that remain invariant under the aforementioned set of continuous transformations. Physically, topological stability means robustness against certain external perturbations. Thus, the transverse conductivity in the Quantum Hall case is stable against moderate disorder and external fields.
Topologically inhomogeneous samples require special care from a theoretical perspective. Global topological indices, e.g. Chern number [24], are not applicable directly to such systems, as they characterize the whole system, just like a single order parameter in the Landau theory. Recently, a family of quasi-topological quantities, called local topological markers, has been developed and studied [25-28]. Such markers depend on the exponentially localized density matrix's elements in equilibrium. Thus, one uses local information to estimate a global topological index. Topological markers are not necessarily strictly quantized; rather, the average of the marker over large areas of a system tends towards a quantized value [29]. The requirement that a marker is a local representative of a global index does not produce a unique definition. Indeed, the Chern number has several local counterparts [25-28,30], each coming with its own merits and drawbacks. The topological markers can be seen as a counterpart of Landau-Ginzburg local order parameter.
Let us now discuss how these three approaches to the phases of equilibrium matter are related to one another. Naturally, there are symmetry-breaking phase transitions within a single topological phase. On the other hand, a topological phase transition does not require symmetry breaking. Therefore, the Landau and topological classifications can be considered complementary to each other. It is possible to incorporate both schemes into a single classification by considering
2Or rather, due to impurities, in fact
symmetry-protected topological phase transitions. Symmetry-protected topological phases are those that remain stable against continuous deformations as long as a particular symmetry is preserved. Therefore, by imposing this condition on a relevant symmetry, a symmetry-breaking phase transition can also be considered topological [31]. The RG approach can be considered more general than the other two, as it can describe both Landau phase transitions and topological phase transitions [11,32]. By considering the topology or symmetries of a fixed point, the RG phase diagram gains physical content.
Despite significant progress in recent years, out-of-equilibrium collective phenomena are far less understood than equilibrium phenomena [33]. Even the definitions of a "phase" and a "phase transition" are not yet entirely clear. Dynamical Quantum Phase Transitions (DQPT) [34,35] are one of the more established and elaborated attempts to build such an understanding. Equilibrium phase transitions occur when a system substantially and sharply changes its properties as some parameter, for example, temperature or concentration, is varied. A dynamical quantum phase transition is a sharp change in a system's properties, which occurs as a function of time rather than a parameter.
1.2 Thesis Structure and Content
This thesis studies the local physics of phase transitions that lack an order parameter. In particular we concentrate on the three classes of such phase transitions. These are Mott metal-to-insulator phase transitions, topological phase transitions in Chern insulators and dynamical quantum phase transitions.
The thesis is structured as follows. Chapter 2 serves as a literature review for the research part of the thesis. Section 2.1 discusses the physics of the Hubbard model [36] and the Mott transition [37]. We introduce the Hubbard model, discuss the weak coupling and the strong coupling limits where the Hubbard model's behavior can be understood analytically. Thereafter we describe numerical algorithms used to study the model with a focus on the Dynamical Mean Field Theory (DMFT) [38]. The section concludes with a discussion of experimental signatures of the Mott transition. Section 2.2 focuses on the field of topological phases of matter [39]. It examines strongly correlated systems exhibiting the integer quantum Hall effect [23], discussing global topological indices and introducing their localized counterparts, called local topological markers. Section 2.3 addresses Dynamical Quantum Phase Transitions (DQPT) [34]. While ordinary phase transitions occur when some of the system's parameters changes and free energy develops an non-analyticity, DQPT happens at particular points in time, when the return rate becomes nonanalytical as a function of time.
Chapter 3 investigates the interplay between the orbital effects of a magnetic field and strong local correlations. The first section studies the lattice quantum Hall effect under the combined effect of finite interactions and non-zero temperatures. We demonstrate that the integer Hall conductivity values deviate from the integer values at temperatures significantly lower than the renormalized non-interacting band gap as a result of transition from an insulator to a weak metal. In the second section, we explore orbital magnetization oscillations behavior in the Hubbard model in the vicinity of a Mott transition. We observe a sharp transtion from 1/B-periodic de Haas-van Alphen oscillations to B-periodic oscillations. This phenomenon, along with its temperature dependence, is proposed as a method to differentiate between a Mott insulator and a band insulator. Thereafter, in the final section of this chapter we predict an insulator-to-metal phase transition induced solely by the orbital effects of a magnetic field.
Chapter 4 explores whether phases lacking an order parameter can be endowed with an analog
of Landau-Ginzburg local order parameter. In particular we concentrate on topological phase transitions and dynamical quantum phase transitions. In the first section Section 4.1, we introduce a local marker for interacting Chern insulators expressed in terms of the single-particle Green's functions. In the second section Section 4.3, we study the dynamics of topological markers in non-interacting systems and discuss the conditions when the markers obey a local continuity equation. This will allow us to make a connection between the markers out-of-equilibrium and the dynamics of magnetic field-induced charges. Finally in Section 4.4 we shall see that a disorder-induced dynamical quantum phase transitions in the transverse field Ising model, being non-topological, cannot be traced by any reasonably local observable.
1.3 Dissertation Goals
The main goals of the thesis are:
1. To study the interplay between orbital effects of magnetic fields and local many-body correlations. On the one hand, we aim to study the effects of magnetic fields on the Mott transition, and on the other hand, how the topological quantum Hall effect [23] and quantum oscillations are altered in the presence of local Hubbard interactions.
2. To propose an experimentally realistic way to discriminate between a Mott insulator and a band insulator.
3. To explore the possibility of introducing an analog of a Landau-Ginzburg order parameter for phase transitions lacking an order parameter. In particular, we will attempt this task in the case of interacting Chern insulators and systems undergoing a dynamical quantum phase transition.
4. To describe locally the change in a topological phase out of equilibrium.
1.4 Statements to Defend
The main scientifically novel results presented in the thesis are:
1. We have developed an extension of dynamical mean field theory [38] suitable for systems in the presence of orbital magnetic fields.
2. We have demonstrated that the inclusion of local correlations at finite temperatures leads to an instability of the Hofstadter fractal structure of the spectrum. We have found a deviation of the Hall conductivity axy from the topologically protected integer values at much lower temperatures than in a corresponding non-interacting system. We demonstrate that these effects can be related to a correlation-driven filling of the band gaps.
3. We have predicted a Mott insulator-to-metal transition driven solely by the orbital effects of the magnetic field. We found that for sufficiently large magnetic fields, a metallic phase emerges at interaction strengths corresponding to the Mott insulating state in the field-free case. Upon decreasing the field, we observe a metal-insulator transition from this metallic to an insulating state. This effect can be understood as a magnetic-field-induced increase in kinetic energy due to the formation of magnetic mini-bands, which enhances the ratio between the kinetic and potential energy and, thus, triggers a transition between a metallic and insulating phase.
4. We have studied the behavior of orbital magnetization at the verge of the Mott transition and observed features specific to the Mott metal-to-insulator transition on both the metallic and insulating sides of the transition. Therefore, the effect could help shed light on the nature of correlated insulating phases in systems where the Mott transition is under debate, such as in twisted bilayer graphene [40] or in vanadium dioxide (VO2) [41].
5. We propose an intrinsically many-body local topological marker based on the single-particle Green's function. Using this marker, we identify topological transitions in finite lattices of a Chern insulator with Anderson disorder and Hubbard interactions. Importantly, our proposal can be generalized to non-equilibrium systems.
6. We have demonstrated that out-of-equilibrium local topological markers obey the local continuity equation for experimentally relevant settings and have connected the out-of-equilibrium marker to the dynamics of magnetic-field-induced charge.
7. We demonstrated that the disorder-induced dynamical quantum phase transition in the Ising model is an example of a non-topological dynamical quantum phase transition without a local order parameter. A series of critical times universally appears for any vanishing perturbation with Fourier components at the lowest momentum of order 1/N3. This could be considered a dynamical counterpart of the Anderson orthogonality catastrophe [42].
1.5 Theoretical and Practical Significance
The first group of results (1-4) is relevant to the physics of strongly interacting systems in large magnetic fields. Magnetic field couples to both spin and orbital magnetic moments. We will concentrate on the orbital coupling. By large magnetic fields, we mean those for which the magnetic length, Ib = eB, is of the order of the lattice spacing, Ib ~ a. This physical regime most directly applies to the physics of moire materials [43]. In these systems, the effective lattice constant can be large enough that moderate magnetic field strengths of several tesla correspond to one flux quantum per unit cell. On the other hand, nearly flat bands emerge in these systems at discrete "magic" twist angles [44]. At these twist angles, strong interactions can be naturally achieved, with U/W ^ 1, where U is the characteristic interaction strength and W is the bandwidth. Moreover, ultra-high magnetic fields of up to 500 T—comprising a noticeable fraction of the flux quantum—have recently been achieved in experiments with more traditional strongly correlated systems, such as VO2 [45] and A-type organic conductors [46].
The results (1-4) might explain magnetic-field-driven insulator-to-metal transitions observed in these systems [40,45,46]. Furthermore, our work may clarify the role of correlations in the formation of insulating correlated states in twisted bilayer graphene [40] and VO2 [45]. Understanding whether an insulating state arises from the Mott mechanism [37] or from symmetry breaking has both practical and fundamental significance. The transition mechanism directly impacts the quantitative characteristics of transistors based on these materials, such as switching times or possible external triggers [41]. Additionally, Mott insulators perhaps doped hosts a variety of exotic quantum phases, including high-temperature superconducting states [47] and spin liquids [48], whereas a doped correlated band insulator typically produces a Fermi liquid state.
The results (5-6) pertain to the physics of spatially inhomogeneous topological systems. A defining property of topological insulators is the formation of robust conducting modes at interfaces between regions with different topological indices [49,50]. This property has numerous
potential applications, including dissipationless power lines [51], new generations of inductors [52], and other electronic devices [53], as well as quantum computation [54]. Therefore, the ability to detect topologically homogeneous regions within a sample and control their locations is of both fundamental and practical interest.
Finally, the last result (7) demonstrates that disorder-induced dynamical quantum phase transitions deviate from the usual equilibrium paradigm. In equilibrium, a phase transition is either topological and characterized by a global "order parameter" or has a local order parameter. We have shown that, out of equilibrium, it is possible for a phase transition to lack both a local order parameter and topological characteristics.
1.6 List of Publications
The work in this thesis is based on the following publications:
1. AA Markov, G Rohringer, and AN Rubtsov. Robustness of the topological quantization of the Hall conductivity for correlated lattice electrons at finite temperatures. Physical Review B, 100(11):115102, 2019
2. AA Markov and AN Rubtsov. Local Marker for Interacting Topological Insulators. Physical Review B, 104(8):L081105, 2021
3. AA Markov, DB Golovanova, AR Yavorsky, and AN Rubtsov. Locality of topological dynamics in Chern insulators. SciPost Physics, 17(6):152, 2024
4. ON Kuliashov, AA Markov, and AN Rubtsov. Dynamical quantum phase transition without an order parameter. Physical Review B, 107(9):094304, 2023
5. G Rohringer and AA Markov. Orbital magnetic field driven metal-insulator transition in strongly correlated electron systems. arXiv preprint arXiv:2406.18729, 2024
6. AA Markov and G Rohringer. Orbital magnetization on the edge of the Mott transition. in preparetion
Four of these are published in peer-reviewed journals.
1.7 Validity and Methods
We have studied the physics of many-body systems using a combination of analytical and numerical approaches. The numerical methods employed in this thesis are either numerically exact (e.g., exact diagonalization) or approximate (dynamical mean field theory [38]). The approximate methods used have been thoroughly tested against other numerical techniques and experimental results [61]. Consequently, all the theoretical results presented in this thesis possess predictive power and can be further validated through experimental testing.
1.8 Validation of the Thesis
The main results were validated during the following international conferences:
1. APS March Meeting, March 7 2019, Boston USA G. Rohringer, A.A. Markov, A.N. Rubtsov "The Hall conductivity in correlated electron systems"
2. Part III Seminar Series, November 30, 2018 Cambridge University, A.A. Markov, G. Rohringer and A.N. Rubtsov "The Quantum Hall Effect in an interacting model"
3. V International Conference on Quantum Technologies, 16th of July 2019 Moscow, A.A. Markov, G. Rohringer and A.N. Rubtsov "Quantum Hall effect in a correlated system at finite temperature"
4. VI International Conference on Quantum Technologies, 14th of July 2021 Moscow, A.A. Markov, G. Rohringer and A.N. Rubtsov "Quantum Hall effect in a correlated system at finite temperature"
5. VI International Conference on Quantum Technologies, 14th of July 2021 Moscow, D.B. Golovanova, A.A. Markov, A.N. Rubtsov "Dynamical control of topological defects in Chern insulator"
6. APS March Meeting March 16, 2022, D.B. Golovanova, A.R. Yavorsky, A.A. Markov, A.N. Rubtsov "Currents of topological marker in dynamically controlled Chern Insulators"
7. Theory Winter School "Modern aspects of quantum condensed matter" January 14th, 2021 Tallahassee, FL , USA "Local marker for topological insulators beyond equilibrium non-interacting systems" A.A. Markov and A.N. Rubtsov
8. ICTP Summer School "New Trends in Modern Quantum Science: from Novel Functional Materials to Quantum Technologies", September 30, 2023 Bukhara, Uzbekiztan A.A. Markov and G. Rohringer "Quantum oscillations of the orbital magnetization in Mott insulators"
Additionally, the results were presented in seminars at the Russian Quantum Center, Moscow State University, Imperial College London and King's College London.
1.9 Personal contribution of the author
All the collaborations are explicitly stated in the corresponding sections. All the statements presented for the defense were initially formulated by the author. The numerical results and analytical proofs presented in the thesis are the product of the author's own work, except for:
• The DMFT calculations of free energy, double occupancy, and magnetization in Section 3.4 and Section 3.3 are due to Georg Rohringer.
• The numerical results and analytical proofs in Section 4.4 were obtained by Oleg Kulyashov. The author co-supervised Oleg's work, proposed the main research directions, and outlined the ideas for the proofs.
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Заключение диссертации по теме «Другие cпециальности», Марков Антон Александрович
5.2 Local Markers for Phase Transitions Without an
Order Parameter
In the first section Section 4.1 of the chapter, we proposed a topological marker for interacting systems that does not rely on reference to a non-interacting Hamiltonian. To the best of our knowledge, such a marker has not previously been proposed. We tested our marker in several contexts, calculating it exactly in the presence of the disorder and interactions. From a computational perspective, our invariant is harder to calculate than the local Chern marker obtained from the topological Hamiltonian, as was done in [297,298]. Our marker involves integration over imaginary time (or summation over all the Matsubara frequencies in equilibrium), which imposes substantial numerical requirements.
However, the proposal seems attractive for several reasons. Firstly, the local markers are not exactly topological invariants. They has a quasi-topological nature, so their local value is not invariant under smooth deformation of the system. Only the average of a marker over an infinite number of sites is topologically robust. Thus, an approach based on smoothly removing interactions, as is done in the topological Hamiltonian approach, and then calculating the LCM of the non-interacting system has not been shown to give the local information that exactly corresponds to the interacting system. Secondly, our approach extends the applicability of topological markers to
systems which cannot be adiabatically connected to a non-interacting topological Hamiltonian. An example is systems with a nontrivial frequency-domain winding number [347]. Lastly, our approach allows us to study Local topological markers in non-stationary settings, for example in quenched topological matter. In the case of adiabatic evolution, the use of a topological Hamiltonian can be put on solid grounds, however for fast dynamics it looks inapplicable. On the other hand, our approach seems to admit a non-equilibrium generalization in the Keldysh formalism [348].
Now, let us summarize the main results for the second section Section 4.3. We have demonstrated that out-of-equilibrium topological markers are highly non-local objects due to a very large contribution from long-ranged diagrams presented in Fig (4.7) to the markers' value. Surprisingly, the long-range character of the correlations allows us to approximate the dynamics with a local continuity equation. We have found that the approximate local continuity equation works well for all the times in large translationally invariant patches. In such systems evolution always starts at the boundaries between the patches and then penetrates the bulk with the LiebRobinson velocity [195]. Intuitively it can be understood as follows. In a translationally invariant system, the local Chern marker cannot change. In the case only the bulk is translationally invariant the boundaries are the source of changes. The spread of correlations from boundary to bulk is a local process. Thus, local is the dynamics of the local Chern marker.
The local continuity approximation allowed us to connect the local Chern marker and on-site magnetic field induced charge in systems containing large translationally invariant patches. In such systems the local Streda marker can be used to estimate local Chern marker values. The experimental recipe is to prepare a system in two ground states: one with a small uniform magnetic field and another without. Then both samples should undergo the same evolution, during which the densities should be compared. Let us stress the dynamical Streda marker in general gives the correct topological information about the system only when it is connected to the local Chern marker.
We have found that the markers are able to evolve in the bulk at the very early times in a large patch with a broken translation symmetry. We observe it in a quench dynamics of disordered systems in Section 4.A.4. Remarkably, even a seemingly formal breaking of the translational symmetry, as in Hofstadter-Harper model is enough to change the character of the evolution. In this case, the local continuity equation approximates the dynamics of the marker at the late times only when the correlations are spread across the sample.
While for locality of the marker's dynamics translational invariance plays the key role, our numerical result hints that the connection between the local Chern marker and the magnetic field response should hold more generally than we have proved analytically. In particular, even in a disordered system, the average of the two markers over bulk sites is in noticeable agreement Section 4.A.4.
Let us suggest possible extensions of our work on local topological markers. Fractional Chern insulators - provide a very interesting context in which to apply a Streda-based Chern marker. Its equations of motion can be applied to many-body systems as they do not rely on single-particle projectors. In an interacting system, the projector onto the filled states is not defined, complicating the generalization of such local markers [56]. On the other hand, recent equilibrium calculations indicate that the Streda-based formula may be used as a local marker for fractional phases [349]. In the absence of the Green's functions zeros the local Green marker should correspond to the local Streda formula [165]. However, the fractional Hall systems do have zeros of Green's funcitons [350]. Therefore, it would be interesting to find a Green's function based marker which would account for these. Another important task for out-of-equlibrium setting is to find an optimal method for controlling the distribution of topological properties. This requires further analytical and numerical
studies of non-homogeneous topological systems out of equilibrium.
In the last section Section 4.4 of the chapter we demonstrated that the disorder-induced dynamical quantum phase transition in the Ising model is an example of a non-topological dynamical quantum phase transition without a local order parameter. A series of critical times universally appears for any vanishing perturbation with Fourier components at the lowest momentum of order 1/N3. This could be considered a dynamical counterpart of the Anderson orthogonality catastrophe [42]. That is, a vanishingly small perturbation causes a large deviation in the many-body wave function, while the observables remain intact. In our setting, it is the Loschmidt echo that changes drastically.
Several intriguing questions can be addressed in future studies. As we have an example of the DQPT where no order parameter can be found, a natural question is whether this phase transition belongs to a larger class with the same property. Vice versa: what class of the DQPTs can be endowed with an order parameter?
Список литературы диссертационного исследования кандидат наук Марков Антон Александрович, 2025 год
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