Article
Chemistry, Physical
Valerii I. I. Kuzmin, Sergey V. V. Nikolaev, Maxim M. M. Korshunov, Sergey G. G. Ovchinnikov
Summary: In order to understand the physics of high-Tc superconducting cuprates, an approach called cluster perturbation theory (CPT) is developed to consider the strong electronic correlations. The effects of exact diagonalization on determining the correlation effects are explicitly taken into account. The CPT is applied to the Hubbard model for cuprates and the doping dependence of the spin susceptibility is studied within CPT and the random phase approximation (RPA).
Article
Materials Science, Multidisciplinary
Jiawei Yan, Vaclav Janis
Summary: This article applies a two-particle semianalytic approach to investigate a single impurity attached to two biased metallic leads. The method allows for the simultaneous treatment of one-particle and two-particle thermodynamic and spectral quantities. It is found that the bias plays a similar role as temperature in destroying the Kondo resonant peak, and low bias applied voltage results in spectral peaks around the lead chemical potentials.
Article
Multidisciplinary Sciences
Peizhi Mai, Seher Karakuzu, Giovanni Balduzzi, Steven Johnston, Thomas A. Maier
Summary: The observation of fluctuating spin and charge stripes in the doped single-band Hubbard model using a quantum Monte Carlo dynamical cluster approximation (DCA) method demonstrates that they survive in the doped Hubbard model in the thermodynamic limit.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Julian Stobbe, Georg Rohringer
Summary: In this study, a new method is proposed to overcome the ambiguity in the calculation of potential energy in dynamical mean-field theory (DMFT). The method introduces an effective mass renormalization parameter and provides satisfactory results in application to a three-dimensional lattice. The method also restores the hierarchy of kinetic energies in the weak coupling regime.
Article
Physics, Multidisciplinary
Cecile Carcy, Gaetan Herce, Antoine Tenart, Tommaso Roscilde, David Clement
Summary: This study provides a joint experimental and theoretical analysis on the adiabatic preparation of ultracold bosons in optical lattices to simulate the three-dimensional Bose-Hubbard model. The measured temperatures are in agreement with theoretical calculations, demonstrating that equilibrium states of the model can be adiabatically prepared in cold-atom apparatus. The Fisher information associated with the thermometry method is most accurate in the critical regime close to the Mott transition, as confirmed in the experiment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Emily Townsend, Tomas Neuman, Alex Debrecht, Javier Aizpurua, Garnett W. Bryant
Summary: The study shows that the behavior of SPEC indicates that when electron-electron correlation plays a minor role, all lowest-energy eigenstates are primarily composed of single-particle excitations of the ground state. As the Coulomb interaction increases, the lowest-energy eigenstates increasingly contain many-particle excitations.
Article
Astronomy & Astrophysics
A. Baroni, J. Carlson, R. Gupta, Andy C. Y. Li, G. N. Perdue, A. Roggero
Summary: The calculation of dynamic response functions is expected to benefit from rapidly developing quantum hardware resources and offers potential applications in analyzing real-time quantities of strongly correlated quantum systems. The calculation of response functions for fermionic systems at moderate momenta and energies is a promising early application due to nearly local relevant operators and the ability to resolve energies in moderately short real time.
Article
Physics, Multidisciplinary
Tsung-Han Lee, Nicola Lanata, Minjae Kim, Gabriel Kotliar
Summary: In this study, an efficient approach based on the rotationally invariant slave-boson framework was developed to compute two-particle response functions and interaction vertices for multiorbital strongly correlated systems. The method was applied to investigate the origin of s-wave orbital antisymmetric spin-triplet superconductivity in the Hund's metal regime using the degenerate three-orbital Hubbard-Kanamori model. The results showed that the pairing instability around the Hund's metal crossover arises from the particle-particle channel while the particle-hole spin fluctuations induce the s-wave pairing instability before entering the Hund's regime.
Article
Mechanics
Juan Jose Mendoza-Arenas
Summary: This study investigates the emergence of dynamical quantum phase transitions in the extended Fermi-Hubbard model using tensor network simulations. The researchers identify various sudden interaction quenches that lead to DQPTs and establish clear connections to specific properties of observables.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Review
Physics, Multidisciplinary
M. Lencses, G. Mussardo, G. Takacs
Summary: In this review, the author discusses the solvability of Integrable Quantum Field Theories using bootstrap techniques based on their elastic and factorisable S-matrix. The author emphasizes the importance of knowledge of scattering amplitudes and matrix elements in determining the exact spectrum of particles and their off-shell dynamics. The article also explores the calculation of universal amplitude ratios and dynamical structure factors, which can be experimentally accessed through methods like inelastic neutron scattering or nuclear magnetic resonance. Additionally, new results regarding generalized susceptibilities in the tricritical Ising universality class are presented.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Materials Science, Multidisciplinary
Tsuneya Yoshida
Summary: In this study, a correlated system in equilibrium with non-Hermitian topology inducing a skin effect was analyzed. The pseudospectrum under different boundary conditions and the impact of line-gap topology were discussed. Numerical simulations revealed that damping of quasiparticles destroys nontrivial line-gap topology while inducing nontrivial point-gap topology, which are reflected in the temperature dependence of local pseudospectral weight.
Article
Materials Science, Multidisciplinary
C. G. L. Bottcher, F. Nichele, J. Shabani, C. J. Palmstrom, C. M. Marcus
Summary: In this study, we explore the vortex dynamics in a two-dimensional Josephson junction array. We observe that the minima of differential resistance undergo a transition and become local maxima at integer and half-integer flux quanta per plaquette. We also observe differences in the transition behavior between the superconducting and anomalous metal phases. Additionally, we find that the transitions show an overall even-odd pattern of skewing around integer f values, which we attribute to vortex commensuration in the square array.
Article
Materials Science, Multidisciplinary
M. Wais, J. Kaufmann, M. Battiato, K. Held
Summary: This study computes the scattering rates of electrons in different lattice models using DMFT and BSE. The results show that the agreement between the two methods varies depending on the strength of the interaction, with significant differences observed in the case of strong interaction.
Article
Multidisciplinary Sciences
Rafael Carballeira, David Dolgitzer, Peng Zhao, Debing Zeng, Yusui Chen
Summary: The study presents a new evolution equation for two-time correlation functions of a generalized non-Markovian open quantum system based on a modified stochastic Schrodinger equation approach. By simplifying and obtaining the two-time reduced propagator, computation costs can be saved and the converging process accelerated. This method can be widely applied to various open quantum models, particularly large-scale systems, and extend quantum regression theory to the non-Markovian case.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Xiao-Qiang Su, Zong-Ju Xu, You-Quan Zhao
Summary: Exploring the role of entanglement in quantum nonequilibrium dynamics is important to understand the mechanism of thermalization in an isolated system. We study the relaxation dynamics in a one-dimensional extended Bose-Hubbard model after a global interaction quench by considering several observables: the local Boson numbers, the nonlocal entanglement entropy, and the momentum distribution functions. The results show that the degree of thermalization is affected by the distance from the integrable point and the size of the subsystem. The Pearson coefficient is employed to measure the correlation between the entanglement entropy and thermalization fidelity, and a strong correlation is demonstrated for the quenched system.
