We develop an inhomogeneous mean‐field theory for the extended Bose‐Hubbard model with a quadratic, confining potential. In the absence of this potential, our mean‐field theory yields the phase diagram of the homogeneous extended Bose‐Hubbard model. This phase diagram shows a superfluid (SF) ...
Renormalized mean-field analysis of antiferromagnetism and d–wave superconductivity in the two–dimensional Hubbard model, Phys - Reiss, Rohe, et al. () Citation Context ...he vertex function is not charge invariant anymore, the flow equations become very complicated. Besides the purely fermionic...
(1996). Dynamical mean-field theory of strongly correlated fermion systems and the limit of infinite dimensions. Reviews of Modern Physics, 68(1), 13-125. [5] Lee, P.A., Nagaosa, N., & Wen, X.G. (2006). Doping a Mott insulator: Physics of high-temperature superconductivity. Reviews...
mean field theoriesHubbard modelsquare latticetriangular latticespin-boson slave-fermion mean field theoriesHartree-Fock mean field theoryxy-SPIRAL spine order/ A7420 Theory of superconductivity A7470V Perovskite phase superconductorsWe summarize some of the results we have obtained in our recent studies ...
fieldtheory,andtheopenproblemsfromourwork. Keywords:BoseHubbardmodel;dynamicalmeanfieldtheory;Mott insulator;Bose-Einsteincondensedphase 目录 第1章引言···1 第2章BOSE-HUBBARD模型的研究综述···4 2.1模型背景···
thefamiliartightbindingmodel. Thesecondtermin(1)accountsforthechemicalpotential,whichfixesthe particlenumberinthegrandcanonicalensemble.Thethirdtermisawayto putinarepulsive(U>0)orattractiveinteractionamongbosonsonthesame latticepoint. 2.MeanFieldSolutionandPhaseDiagram Inasimplemean-fieldtheoreticalapproach,wein...
The recently introduced concept of exact mean-field theories is applied to the extended simplified Hubbard model, which is a one-band extended Hubbard mode... V Dongen,GJ P. - 《Phys Rev B Condens Matter》 被引量: 174发表: 1992年 Dynamical Mean Field Theory of the Bose-Hubbard Model Quan...
Using functional techniques, the Hubbard model consisting of self-coupled lattice fermions is transformed into a bosonic functional integral. In this form it is treated by a mean field approximation in its modern version as a systematic expansion around a saddle point. The method is generalized to...
The dynamical mean-field approximation (DMFA) becomes exact in the limit of infinite dimensions, and allows results to be obtained in a nonperturbative regime without the limitations normally found with exact diagonalization (ED) and quantum Monte Carlo (QMC) methods. In this paper, we investigate...
Results for the density of states fromperturbation theory at $U/W=0.4$ agree very well with those from the DynamicalMean-Field Theory treated with the Fixed-Energy Exact Diagonalization and withthe Dynamical Density-Matrix Renormalization Group. In contrast, our resultsreveal the limited resolution ...