Single-particle excitations in the normal state of the negative-U Hubbard model

1994 ◽  
Vol 6 (30) ◽  
pp. 5839-5858 ◽  
Author(s):  
S V Traven
Keyword(s):  
Hubbard Model ◽  
Single Particle ◽  
Normal State

A controlled route to the competing phases and the single-particle spectral function in the ground state of the 2D Hubbard model

2007 ◽  
Vol 460-462 ◽  
pp. 248-251
Author(s):  
Werner Hanke ◽  
Markus Aichhorn ◽  
Enrico Arrigoni ◽  
Michael Potthoff
Keyword(s):  
Hubbard Model ◽  
Spectral Function ◽  
Single Particle ◽  
Ground State

scholarly journals High-Energy Kink in the Single-Particle Spectra of the Two-Dimensional Hubbard Model

2007 ◽  
Vol 99 (23) ◽  
Author(s):  
Alexandru Macridin ◽  
M. Jarrell ◽  
Thomas Maier ◽  
D. J. Scalapino
Keyword(s):  
Hubbard Model ◽  
Single Particle ◽  
High Energy ◽  
Two Dimensional ◽  
Particle Spectra

SUPERCONDUCTIVITY AND FERROMAGNETISM IN HYBRID SYSTEMS

2003 ◽  
Vol 17 (04n06) ◽  
pp. 661-667
Author(s):  
MARIO CUOCO ◽  
CANIO NOCE
Keyword(s):  
Phase Diagram ◽  
Charge Transfer ◽  
Single Particle ◽  
Normal State ◽  
Exchange Coupling ◽  
Spin Exchange ◽  
Critical Value ◽  
Particle Charge ◽  
Spin Singlet

Interplay of superconductivity (SC) and ferromagnetism (FM) is studied in a system constituted of alternated planes with FM metallicity and spin singlet SC, respectively. The phase diagram of the SC, FM, and normal state is obtained as the amplitude of the single particle charge transfer between the planes is varied. One important finding is the appearance of a region with coexistence of SC and FM at small values of the interlayer hopping amplitude, though the FM exchange coupling is below the critical value indicated by the Stoner criterium. We consider the role of the direct spin exchange coupling with respect to the degree of hybridization between FM and SC fermions and how those mechanisms may destroy the coexisting phase. Relation to exotic superconductors recently discovered, as the ruthenate-cuprate compound of the class RuSr 2 GdCu 2 O 8, is also presented.

scholarly journals Tensor-network Study of Correlation-spreading Dynamics in the Two-dimensional Bose-Hubbard Model

2021 ◽  
Author(s):  
Ryui Kaneko ◽  
Ippei Danshita
Keyword(s):  
Hubbard Model ◽  
Single Particle ◽  
Correlation Functions ◽  
Cold Atoms ◽  
Spatial Dimension ◽  
Two Dimensional ◽  
Particle Correlation ◽  
Time Dynamics ◽  
Density Correlation ◽  
Tensor Network

Abstract Recent developments in analog quantum simulators based on cold atoms and trapped ions call for cross-validating the accuracy of quantum-simulation experiments with use of quantitative numerical methods; however, it is particularly challenging for dynamics of systems with more than one spatial dimension. Here we demonstrate that a tensor-network method running on classical computers is useful for this purpose. We specifically analyze real-time dynamics of the two-dimensional Bose-Hubbard model after a sudden quench starting from the Mott insulator by means of the infinite projected entangled pair state algorithm. Calculated single-particle correlation functions are found to be in good agreement with a recent experiment [Y. Takasu et al., Sci. Adv. 6, eaba9255 (2020)]. By estimating the phase and group velocities from the single-particle and density-density correlation functions, we predict how these velocities vary in the moderate interaction region, which serves as a quantitative benchmark for future experiments.

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