Physical Review B最新文献_第5页

Optical manifestations and bounds of topological Euler class

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-02-04 DOI: 10.1103/physrevb.111.l081103

Wojciech J. Jankowski, Arthur S. Morris, Adrien Bouhon, F. Nur Ünal, Robert-Jan Slager

{"title":"Optical manifestations and bounds of topological Euler class","authors":"Wojciech J. Jankowski, Arthur S. Morris, Adrien Bouhon, F. Nur Ünal, Robert-Jan Slager","doi":"10.1103/physrevb.111.l081103","DOIUrl":"https://doi.org/10.1103/physrevb.111.l081103","url":null,"abstract":"We analyze quantum-geometric bounds on optical weights in topological phases with pairs of bands hosting nontrivial Euler class, a multigap invariant characterizing non-Abelian band topology. We show how the bounds constrain the combined optical weights of the Euler bands at different dopings and further restrict the size of the adjacent band gaps. In this process, we also consider the associated interband contributions to dc conductivities in the flat-band limit. We physically validate these results by recasting the bound in terms of transition rates associated with the optical absorption of light, and demonstrate how the Euler connections and curvatures can be determined through the use of momentum and frequency-resolved optical measurements, allowing for a direct measurement of this multiband invariant. Additionally, we prove that the bound holds beyond the degenerate limit of Euler bands, resulting in nodal topology captured by the patch Euler class. In this context, we deduce optical manifestations of Euler topology within k</a:mi>·</a:mo>p</a:mi></a:mrow></a:math> models, which include quantized optical conductivity, and third-order jerk photoconductivities. We showcase our findings with numerical validation in lattice-regularized models that benchmark effective theories for real materials and are realizable in metamaterials and optical lattices. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"7 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143124835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Single-particle spectral function of fractional quantum anomalous Hall states

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-02-04 DOI: 10.1103/physrevb.111.075108

Fabian Pichler, Wilhelm Kadow, Clemens Kuhlenkamp, Michael Knap

{"title":"Single-particle spectral function of fractional quantum anomalous Hall states","authors":"Fabian Pichler, Wilhelm Kadow, Clemens Kuhlenkamp, Michael Knap","doi":"10.1103/physrevb.111.075108","DOIUrl":"https://doi.org/10.1103/physrevb.111.075108","url":null,"abstract":"Fractional quantum Hall states are the most prominent example of states with topological order, hosting excitations with fractionalized charge. Recent experiments in twisted MoTe</a:mtext>2</a:mn></a:msub></a:math> and graphene-based heterostructures provided evidence of fractional quantum anomalous Hall (FQAH) states, which spontaneously break time-reversal symmetry and persist even without an external magnetic field. Understanding the unique properties of these states requires the characterization of their low-energy excitations. To that end, we construct a parton theory for the energy- and momentum-resolved single-particle spectral function of FQAH states. We explicitly consider several experimentally observed filling fractions as well as a composite Fermi liquid in the half-filled Chern band. Charge fractionalization manifests itself in nearly momentum-independent spectra with a characteristic series of peaks determined from the filling fraction. The parton description qualitatively captures our numerical exact diagonalization results. Additionally, we discuss how the finite bandwidth of the Chern band and the nonideal quantum geometry affect the fractionalized excitations. Our work demonstrates that the energy- and momentum-resolved electronic single-particle spectral function provides a valuable tool to characterize fractionalized excitations of FQAH states in moiré lattices. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"30 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143124837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Saturable absorption in highly excited laser-irradiated silicon and its suppression at the surface

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-02-03 DOI: 10.1103/physrevb.111.075105

Shunsuke Yamada, Tomohito Otobe

{"title":"Saturable absorption in highly excited laser-irradiated silicon and its suppression at the surface","authors":"Shunsuke Yamada, Tomohito Otobe","doi":"10.1103/physrevb.111.075105","DOIUrl":"https://doi.org/10.1103/physrevb.111.075105","url":null,"abstract":"Nonlinear electronic excitation in laser-irradiated silicon at finite electron temperatures is numerically investigated by first-principles calculations based on the time-dependent density functional theory. In bulk silicon at finite temperatures under near-infrared laser irradiation, we found that the absorbed energy is saturated when using a certain laser intensity even with a few-cycle pulse. Although one-photon processes of conduction-to-conduction and valence-to-valence transitions are dominant at such a laser intensity, the Pauli blocking inhibits further one-photon transition. With higher intensities, multiphoton excitation across the bandgap overwhelms the one-photon excitation and the saturable absorption disappears. At the surface of finite-temperature silicon, the Pauli blocking is suppressed by the symmetry breaking and the absorbed energy is relatively enhanced from the energy of the saturable absorption in the bulk region. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"14 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electric field driven domain wall dynamics in BaTiO3 nanoparticles

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-02-03 DOI: 10.1103/physrevb.111.054101

Jialun Liu, David Yang, Ana F. Suzana, Steven J. Leake, Ian K. Robinson

{"title":"Electric field driven domain wall dynamics in BaTiO3 nanoparticles","authors":"Jialun Liu, David Yang, Ana F. Suzana, Steven J. Leake, Ian K. Robinson","doi":"10.1103/physrevb.111.054101","DOIUrl":"https://doi.org/10.1103/physrevb.111.054101","url":null,"abstract":"We report a detailed investigation into the response of single BaTiO</a:mi>3</a:mn></a:msub></a:math> (BTO) nanocrystals under applied electric fields (E-field) using Bragg coherent diffraction imaging. Our study reveals pronounced domain wall migration and expansion of a sample measure under applied electric field. The changes are most prominent at the surface of the nanocrystal, where the lack of external strain allows greater domain wall mobility. The observed domain shifts are correlated to the strength and orientation of the applied E-field, following a side-by-side domain model from Suzana []. Notably, we identified a critical electric field strength of 3 MV/m, which leads to irreversible structural changes, suggesting plastic deformation. The findings highlight how surface effects and intrinsic defects contribute to the enhanced dielectric properties of BTO at the nanoscale, in contrast to bulk materials, where strain limits domain mobility. These findings deepen our understanding of nanoscale dielectric behavior and inform the design of advanced nanoelectronic devices. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"10 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective time-dependent temperature for fermionic master equations beyond the Markov and the secular approximations

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-02-03 DOI: 10.1103/physrevb.111.085103

Lukas Litzba, Eric Kleinherbers, Jürgen König, Ralf Schützhold, Nikodem Szpak

{"title":"Effective time-dependent temperature for fermionic master equations beyond the Markov and the secular approximations","authors":"Lukas Litzba, Eric Kleinherbers, Jürgen König, Ralf Schützhold, Nikodem Szpak","doi":"10.1103/physrevb.111.085103","DOIUrl":"https://doi.org/10.1103/physrevb.111.085103","url":null,"abstract":"We consider a fermionic quantum system exchanging particles with an environment at a fixed temperature and study its reduced evolution by means of a Redfield-I equation with time-dependent (non-Markovian) coefficients. We find that the description can be efficiently reduced to a standard-form Redfield-II equation, however, with a obeying a universal law. At early times, after the system and environment start in a product state, the appears to be very high, yet eventually it settles down towards the true environment value. In this way, we obtain a time-local master equation, offering high accuracy at all times and preserving the crucial properties of the density matrix. It includes non-Markovian relaxation processes beyond the secular approximation and time-averaging methods and can be further applied to various types of Gorini-Kossakowski-Sudarshan-Lindblad equations. We derive the theory from first principles and discuss its application using a simple example of a single quantum dot. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"16 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Origin of the anomalous Hall effect in Cr-doped RuO2

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-02-03 DOI: 10.1103/physrevb.111.064406

Andriy Smolyanyuk, Libor Šmejkal, Igor I. Mazin

{"title":"Origin of the anomalous Hall effect in Cr-doped RuO2","authors":"Andriy Smolyanyuk, Libor Šmejkal, Igor I. Mazin","doi":"10.1103/physrevb.111.064406","DOIUrl":"https://doi.org/10.1103/physrevb.111.064406","url":null,"abstract":"RuO</a:mi>2</a:mn></a:msub></a:math> is one of the most highlighted candidates for altermagnetism. However, the most recent muon spin spectroscopy and neutron studies demonstrated the absence of magnetic order in this system. The electronic structure of <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:msub><b:mi>RuO</b:mi><b:mn>2</b:mn></b:msub></b:math> hints at a possibility of realizing a magnetically ordered state upon hole doping, and such a possibility was explored experimentally in Cr-doped <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:msub><c:mi>RuO</c:mi><c:mn>2</c:mn></c:msub></c:math>, where it was suggested that this system exhibits the anomalous Hall effect (AHE) due to altermagnetism. In this paper, based on our density functional calculations, we revise the results obtained for this system and propose a different interpretation of experimental results. Our calculations suggest that extra holes are bound to Cr impurity and do not dope Ru bands, which remain nonmagnetic. Thus, the observed AHE is not due to the altermagnetism but stems entirely from magnetic Cr ions. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"51 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Variational neural and tensor network approximations of thermal states

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-02-03 DOI: 10.1103/physrevb.111.075102

Sirui Lu, Giacomo Giudice, J. Ignacio Cirac

引用次数: 0

Atom-wise formulation of the many-body dispersion problem for linear-scaling van der Waals corrections

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-02-03 DOI: 10.1103/physrevb.111.054103

Heikki Muhli, Tapio Ala-Nissila, Miguel A. Caro

{"title":"Atom-wise formulation of the many-body dispersion problem for linear-scaling van der Waals corrections","authors":"Heikki Muhli, Tapio Ala-Nissila, Miguel A. Caro","doi":"10.1103/physrevb.111.054103","DOIUrl":"https://doi.org/10.1103/physrevb.111.054103","url":null,"abstract":"A common approach to modeling dispersion interactions and overcoming the inaccurate description of long-range correlation effects in electronic structure calculations is the use of pairwise-additive potentials, as in the Tkatchenko-Scheffler [] method. In previous work [H. Muhli , ], we have shown how these are amenable to highly efficient atomistic simulation by machine learning their local parametrization. However, the atomic polarizability and the electron correlation energy have a complex and nonlocal many-body character and some of the dispersion effects in complex systems are not sufficiently described by these types of pairwise-additive potentials. Currently, one of the most widely used rigorous descriptions of the many-body effects is based on the many-body dispersion (MBD) model [A. Tkatchenko , ]. In this work, we show that the MBD model can also be locally parametrized to derive a local approximation for the highly nonlocal many-body effects. With this local parametrization, we develop an atomwise formulation of MBD that we refer to as linear MBD (lMBD), as this decomposition enables linear scaling with system size. This model provides a transparent and controllable approximation to the full MBD model with tunable convergence parameters for a fraction of the computational cost observed in electronic structure calculations with popular density-functional theory codes. We show that our model scales linearly with the number of atoms in the system and is easily parallelizable. Furthermore, we show how using the same machinery already established in previous work for predicting Hirshfeld volumes with machine learning enables access to large-scale simulations with MBD-level corrections. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"15 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Emergent topology in many-body dissipative quantum matter

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-01-31 DOI: 10.1103/physrevb.111.035157

Antonio M. García-García, Lucas Sá, Jacobus J. M. Verbaarschot, Can Yin

{"title":"Emergent topology in many-body dissipative quantum matter","authors":"Antonio M. García-García, Lucas Sá, Jacobus J. M. Verbaarschot, Can Yin","doi":"10.1103/physrevb.111.035157","DOIUrl":"https://doi.org/10.1103/physrevb.111.035157","url":null,"abstract":"The identification, description, and classification of topological features is an engine of discovery and innovation in several fields of physics. This research encompasses a broad variety of systems, from the integer and fractional Chern insulators in condensed matter, to protected states in complex photonic lattices in optics, and the structure of the QCD vacuum. Here, we introduce another playground for topology: the dissipative dynamics of pseudo-Hermitian many-body quantum systems. For that purpose, we study two different systems, the dissipative Sachdev-Ye-Kitaev (SYK) model, and a quantum chaotic dephasing spin chain. For the two different many-body models, we find the same topological features for a wide range of parameters suggesting that they are universal. In the SYK model, we identify four universality classes, related to pseudo-Hermiticity, characterized by a rectangular block representation of the vectorized Liouvillian that is directly related to the existence of an anomalous trace of the unitary operator implementing fermionic exchange. As a consequence of this rectangularization, we identify a topological index ν</a:mi></a:math> that only depends on symmetry. Another distinct consequence of the rectangularization is the observation, for any coupling to the bath, of purely real topological modes in the Liouvillian. The level statistics of these real modes agree with that of the corresponding random matrix ensemble and therefore can be employed to characterize the four topological symmetry classes. In the limit of weak coupling to the bath, topological modes govern the approach to equilibrium, which may enable a direct path for experimental confirmation of topology in dissipative many-body quantum chaotic systems. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"39 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of the London penetration depth with the tunnel diode oscillator technique

IF 3.7 2区物理与天体物理

Physical Review B Pub Date : 2025-01-31 DOI: 10.1103/physrevb.111.024514

G. P. Mikitik

{"title":"Determination of the London penetration depth with the tunnel diode oscillator technique","authors":"G. P. Mikitik","doi":"10.1103/physrevb.111.024514","DOIUrl":"https://doi.org/10.1103/physrevb.111.024514","url":null,"abstract":"Using a distribution of the Meissner currents over the surface of an infinitely long superconducting slab with a rectangular cross section, the magnetic moment of the slab is calculated, taking into account corrections associated with a small but finite value of the London penetration depth λ</a:mi></a:math>. Since these corrections determine the shift of the resonant frequency in the tunnel-diode oscillator technique, formulas for determining <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mi>λ</b:mi></b:math> within this technique are derived for the slab. These formulas are valid for any aspect ratio of its cross section, and they differ from those that are often used in analyzing experimental data. Specifically, it is shown that the sharp edges of the slab can cause a large frequency shift proportional to the change in the value of <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:msup><c:mi>λ</c:mi><c:mrow><c:mn>2</c:mn><c:mo>/</c:mo><c:mn>3</c:mn></c:mrow></c:msup></c:math>. Although this result complicates the extraction of a temperature dependence of <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"><d:mi>λ</d:mi></d:math> from the frequency shift, it also opens up additional possibilities for determining the London penetration depth. In particular, under certain conditions, it is possible not only to measure the changes in <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mi>λ</e:mi></e:math> with temperature, but also to estimate its absolute value. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"53 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0