Results 41 to 50 of about 13,863,108 (200)
Exceptional points in the one-dimensional Hubbard model
New Journal of Physics, 2021 Non-Hermitian phenomena offer a novel approach to analyze and interpret spectra in the presence of interactions. Using the density-matrix renormalization group (DMRG), we demonstrate the existence of exceptional points for the one-particle Green’s ...
Roman Rausch +2 more
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Thermodynamics of the planar Hubbard model [PDF]
Physical Review B, 2003 The thermodynamic properties: specific heat and entropy are studied as a function of temperature and doping within the two-dimensional Hubbard model with various U/t=4-12. Quantities are calculated using the finite-temperature Lanczos method with additional phase-averaging for a system of 4×4 sites.
Bonca, J., Prelovsek, P.
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Impurity dephasing in a Bose–Hubbard model
New Journal of Physics, 2021 We study the dynamics of a two-level impurity embedded in a two-dimensional Bose–Hubbard (BH) model at zero temperature from an open quantum system perspective. Results for the decoherence across the whole phase diagram are presented, with a focus on the
Fabio Caleffi +3 more
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Fidelity approach to the Hubbard model [PDF]
Physical Review B, 2008 We use the fidelity approach to quantum critical points to study the zero temperature phase diagram of the one-dimensional Hubbard model. Using a variety of analytical and numerical techniques, we analyze the fidelity metric in various regions of the phase diagram, with particular care to the critical points. Specifically we show that close to the Mott
Venuti L Campos +5 more
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SciPost Physics, 2017 The Algorithms for Lattice Fermions package provides a general code for the finite temperature auxiliary field quantum Monte Carlo algorithm. The code is engineered to be able to simulate any model that can be written in terms of sums of single-body ...
Martin Bercx, Florian Goth, Johannes S. Hofmann, Fakher F. Assaad
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One-electron singular spectral features of the 1D Hubbard model at finite magnetic field
Nuclear Physics B, 2017 The momentum, electronic density, spin density, and interaction dependences of the exponents that control the (k,ω)-plane singular features of the σ=↑,↓ one-electron spectral functions of the 1D Hubbard model at finite magnetic field are studied.
J.M.P. Carmelo, T. Čadež
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Embedded multi-boson exchange: A step beyond quantum cluster theories
Physical Review ResearchWe introduce a diagrammatic multi-scale approach to the Hubbard model based on the interaction-irreducible (multi-boson) vertex of a small cluster embedded in a self-consistent medium.
Dominik Kiese +5 more
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Hubbard Model on Decorated Lattices [PDF]
Physical Review Letters, 2003 We introduce a family of lattices for which the Hubbard model and its natural extensions can be quasi-exactly solved, i.e. solved for the ground and low energy states. In particular, we show rigorously that the ground state of the Hubbard model with off-site Coulomb repulsions on a decorated Kagomè lattice is an ordered array of local currents. The low
Batista, CD, Shastry, BS
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New Journal of Physics, 2015 We introduce a scheme that combines photon-assisted tunneling (PAT) by a moving optical lattice with strong Hubbard interactions, and allows for the quantum simulation of paradigmatic quantum many-body models.
Alejandro Bermudez, Diego Porras
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