Article
Materials Science, Multidisciplinary
Yi-Hsuan Liu, Sheng Zhang, Puhan Zhang, Ting-Kuo Lee, Gia-Wei Chern
Summary: The study introduces a machine learning model for predicting local electronic properties of disordered correlated electron systems. It shows that local electronic properties mainly depend on the immediate environment, and demonstrates good agreement between machine learning predictions and experimental data.
Article
Materials Science, Multidisciplinary
Steffen Backes, Jae-Hoon Sim, Silke Biermann
Summary: Motivated by the physics of quasi-two-dimensional fermionic systems, many-body computational methods that include both local and nonlocal electronic correlations are rapidly evolving. Methods may be hindered by the emergence of noncausal features, but the presented approach extends local many-body techniques to nonlocal correlations while preserving causality.
Article
Physics, Multidisciplinary
A. Erpenbeck, E. Gull, G. Cohen
Summary: We propose a numerically exact method for nonequilibrium quantum impurity models, which directly formulates in the steady state, eliminating the need to traverse the transient dynamics and reducing computational costs. The method is benchmarked on quantum dots in the noninteracting and Kondo regime, as well as correlated materials driven away from equilibrium. Qualitative differences are observed in the response to bias voltage between correlated materials and bias-driven quantum dots.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Giacomo Mazza, Adriano Amaricci, Massimo Capone
Summary: Heterostructures formed by stacking layers of two s-wave superconductors with different coupling strengths show enhanced superconducting critical temperature, with two distinct physical regimes identified based on the thickness of the larger layer.
Article
Materials Science, Multidisciplinary
Tarun Tummuru, Alberto Nocera, Ian Affleck
Summary: Majorana modes can emerge on the surface of a topological superconductor, with attractive interactions potentially driving a phase transition in the topological state. Numerical simulations can be used to study this phenomenon.
Article
Multidisciplinary Sciences
Wei Wu, Xiang Wang, Andre-Marie Tremblay
Summary: In this study, the electronic scattering rate in cuprate superconductors was investigated using cluster generalization of dynamical mean-field theory, revealing the presence of a non-Fermi liquid phase with linear temperature dependence of the scattering rate, originating from antiferromagnetic fluctuations.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Manuel I. Diaz, Jong E. Han, Camille Aron
Summary: Motivated by the resistive switchings in transition-metal oxides induced by a voltage bias, this study investigates the far-from-equilibrium dynamics of an electric-field-driven strongly correlated model. It reveals that the electric field can drive both metal-to-insulator and insulator-to-metal transitions, and these transitions can be unified in a single framework once the excitations are accounted for in terms of an effective temperature.
Article
Materials Science, Multidisciplinary
Tao Zhu, Mauro Antezza, Jian-Sheng Wang
Summary: In this work, different theoretical approaches were used to analyze the electronic polarizability of graphene. It was found that the tight-binding method is as effective as the ab initio approach in calculating the polarizability of graphene. The special Dirac-cone band structure of graphene allows the Dirac model to reproduce results of the tight-binding method for energy smaller than 3 eV.
Article
Materials Science, Multidisciplinary
Vladislav Pokorny, Panch Ram
Summary: In this study, the behavior of in-gap bands in a heterostructure was investigated using the periodic Anderson model with superconducting correlations, and the lattice model was mapped onto the superconducting single impurity model using dynamical mean-field theory. Two distinct superconducting phases were observed in phase diagrams, each corresponding to different induced pairing signs, and the evolution of the spectral function near the transition was discussed. Additionally, the failure of iterative perturbation theory for superconducting models with spinful ground state and the behavior of the average expansion order in the continuous-time hybridization expansion simulation were explored.
Article
Crystallography
Ka-Ming Tam, Hanna Terletska, Tom Berlijn, Liviu Chioncel, Juana Moreno
Summary: A real space cluster extension method was developed to study Anderson localization, successfully capturing the phenomena in all disorder regimes. The approach accurately obtained the critical disorder strength for 3D Anderson localization and systematically recovered the re-entrance behavior of the mobility edge. This methodology offers potential to study Anderson localization at surfaces within quantum embedding theory, allowing for the exploration of the interplay between topology and Anderson localization from first principles.
Article
Chemistry, Physical
Raghavendra Meena, Guanna Li, Michele Casula
Summary: Through quantum Monte Carlo calculations, we studied the ground-state properties of the narrowest zigzag graphene nanoribbon and found that it exhibits correlated behavior and has an antiferromagnetic ground state. The calculated antiferromagnetic stabilization energy and magnetization are sizeable, suggesting the persistence of antiferromagnetic correlations above room temperature. These results have significant implications for the study of graphene nanoribbons and similar systems.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
T. H. Y. Nguyen, D. A. Le, A. T. Hoang
Summary: In this study, we investigate Anderson localization in the half-filled Anderson-Hubbard model with random on-site interactions or spatially alternating interactions. By using dynamical mean field theory and the equation of motion method as an impurity solver, we calculate the arithmetically and geometrically averaged local density of states and derive the equations determining the critical value for the phase transition between metallic, Anderson and Mott insulating phases. The nonmagnetic ground state phase diagrams are constructed numerically, and we observe that Coulomb disorder drives the system towards Anderson localization phase even without Anderson structural disorder. Additionally, for spatially alternating interactions, we find that increasing interaction modulation reduces the metallic region and enlarges the Anderson insulator region. These findings are relevant to the study of ultracold atoms in disordered optical lattices and can be experimentally observed using ultracold atom techniques.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Xiao-Cheng Bai, Ya-Min Quan, H. -Q. Lin, Liang-Jian Zou
Summary: We studied the effects of electronic and magnetic correlations as well as doping on the ground-state properties of Ba2CuO4-delta superconductor. Our results show that the system transitions from a two-band character to a single-band character with increasing doping concentration, and the s-wave and d-wave superconducting pairing become significant in the realistic superconducting state.
Article
Physics, Multidisciplinary
Eric De Giuli, Camille Scalliet
Summary: This study examines the dynamics and stability of species' abundances in both natural ecosystems and biochemical reaction networks. By deriving and analyzing the large-scale description of a reaction network, the authors uncover key factors and limitations in maintaining diversity. The findings have important implications for understanding the stability of ecological systems and biochemical reaction networks.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Physics, Multidisciplinary
Philipp Werner, Steven Johnston, Martin Eckstein
Summary: RIXS is a tool for detecting various types of high- and low-energy elementary excitations in correlated solids, and it plays an increasingly important role in investigating time-dependent phenomena in photo-excited systems. The study demonstrates the feasibility of multi-orbital nonequilibrium RIXS calculations and the sensitivity of the quasi-elastic fluorescence-like features and d-d excitation peaks to the nonequilibrium population of the Hubbard bands.
Article
Materials Science, Multidisciplinary
Youjiang Xu, Irakli Titvinidze, Walter Hofstetter
Summary: We have demonstrated the ubiquity of invisible bands associated with zeros of the single-particle Green's function at topological interfaces of two-dimensional Chern insulators, which are dual to the chiral edge/domain-wall modes. This was achieved by studying the domain walls of a repulsive Hubbard model with a topological flat band using real-space dynamical mean-field theory. Our numerical results further revealed that the chiral modes are split into branches due to interaction, with these branches connected by invisible flat bands. This work provides valuable insights into interacting topological systems.
Article
Materials Science, Multidisciplinary
Morad Ebrahimkhas, Goetz S. Uhrig, Walter Hofstetter, Mohsen Hafez-Torbati
Summary: In this paper, the existence of an antiferromagnetic Chern insulator (AFCI) in a square-lattice model is demonstrated. The study shows that the AFCI can be formed due to the spin-orbit coupling and strong electronic correlation, which suggests the generic consequence of these factors beyond a specific model or lattice structure. The AFCI has potential applications for a strong magnetic blueshift of the charge gap below the Neel temperature and for realizing the quantum anomalous Hall effect at higher temperatures.
Article
Materials Science, Multidisciplinary
Irakli Titvinidze, Julian Legendre, Karyn Le Hur, Walter Hofstetter
Summary: In this study, we investigated the Hubbard model with time-reversal-invariant flux, spin-orbit coupling, and position-dependent onsite energies on the kagome lattice using numerical and analytical methods. By employing real-space dynamical mean-field theory and other approaches, we obtained a rich phase diagram and explored the topological and magnetic properties of the system.
Article
Optics
Mathieu Barbier, Henrik Luetjeharms, Walter Hofstetter
Summary: Using trapped Rydberg-excited p states in an optical lattice, the ground-state phase diagram and different regimes of an extended two-component Bose-Hubbard model are studied. The anisotropic interaction is found to be more advantageous for observing supersolid phases compared to the isotropic case.
Article
Optics
Mathieu Barbier, Simon Hollerith, Walter Hofstetter
Summary: This work proposes the use of bosonic quantum gases dressed with molecular bound states in Rydberg interaction potentials to observe novel phases of matter in extended Hubbard models. It studies the molecular Rabi coupling with respect to the effective principal quantum number and trapping frequency of ground-state atoms, as well as the resulting dressed interaction strength. Additionally, a two-color excitation scheme is proposed to enhance dressed interaction and cancel ac Stark shifts.
Article
Materials Science, Multidisciplinary
Irakli Titvinidze, Julian Legendre, Maarten Grothus, Bernhard Irsigler, Karyn Le Hur, Walter Hofstetter
Summary: The study explores the topological properties of a spin-orbit coupled tight-binding model with flux on the kagome lattice, which includes a Z(2) topological insulator, inequivalent sites, flat band, and topological dispersive energy bands. It demonstrates the stability of the topological phase against spin-flip processes and different types of on-site potentials, as well as the possibility of different on-site energies within a unit cell.
Article
Materials Science, Multidisciplinary
Bernhard Irsigler, Tobias Grass, Jun-Hui Zheng, Mathieu Barbier, Walter Hofstetter
Summary: By studying the dynamical mean-field theory, we found that the Chern numbers of topological phases become trivial when interactions lead to insulating behavior. We also evaluated the topological properties of quasiparticle bands and so-called blind bands to gain a deeper understanding of the Weyl-semimetal-to-Mott-insulator topological phase transition. Additionally, we considered a system with an open boundary along one spatial direction to study correlation effects of surface states.
Article
Materials Science, Multidisciplinary
Morad Ebrahimkhas, Mohsen Hafez-Torbati, Walter Hofstetter
Summary: This study investigates the influence of lattice symmetry on the emergence of antiferromagnetic quantum Hall states in systems with nontrivial topological bands. By extending the spinful Harper-Hofstadter model with next-nearest-neighbor hopping, a quantum Hall insulator with Chern number C = 2 is realized. The phase diagram shows the presence of a C = 1 stripe antiferromagnetic quantum Hall insulator for large next-nearest-neighbor hopping, but no equivalent Ned antiferromagnetic quantum Hall insulator for small next-nearest-neighbor hopping. It is discussed that a C = 1 antiferromagnetic quantum Hall insulator can only emerge when the effect of the spin-flip transformation cannot be compensated by a space-group operation.
Article
Physics, Multidisciplinary
Bernhard Irsigler, Jun-Hui Zheng, Fabian Grusdt, Walter Hofstetter
PHYSICAL REVIEW RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
Jaromir Panas, Bernhard Irsigler, Jun-Hui Zheng, Walter Hofstetter
Article
Materials Science, Multidisciplinary
Mohsen Hafez-Torbati, Jun-Hui Zheng, Bernhard Irsigler, Walter Hofstetter
Article
Optics
Urs Gebert, Bernhard Irsigler, Walter Hofstetter
Article
Materials Science, Multidisciplinary
A. Oestlin, Y. Zhang, H. Terletska, F. Beiuseanu, V Popescu, K. Byczuk, L. Vitos, M. Jarrell, D. Vollhardt, L. Chioncel
Article
Optics
Jun-Hui Zheng, Bernhard Irsigler, Lijia Jiang, Christof Weitenberg, Walter Hofstetter
Article
Optics
Bernhard Irsigler, Jun-Hui Zheng, Walter Hofstetter