For this we develop an inhomogeneous mean-field theory. Our results for the BH model with one type of spinless bosons agrees quantitatively with quantum Monte Carlo (QMC) simulations. Our approach is numerically less intensive than such simulations, so we are able to perform calculation on ...
We develop a mean-field theory to analyze the ordering processes and compare the result with that obtained by simulations, and discuss the mechanism of the competition of these two orders. We also study how the supersolid region shrinks as the on-site repulsion becomes strong....
The effect of the next-nearest-neighbor (nnn) tunneling on the hard-core extended Bose-Hubbard model on square lattices is investigated. By means of the cluster mean-field theory, the ground-state phase diagrams are determined. When a modest nnn tunneling is introduced, depending on its sign,...
关键词:Bose-Hubbard模型;动力学平均场理论;Mott绝缘体;Bose-Einstein 凝聚相 1 2 /U Abstract Inthisdissertation,wefirstpresentanintroductionofthestudy ontheBose-Hubbardmodel,includingthebackgroundandtheoretical methods.Thenwebrieflyintroducethedynamicalmeanfieldtheoryand itsdevelopment.Thedynamicalmeanfieldtheory(...
Bose-HubbardModel StanimirKondov May5,2008 Abstract TheBose-Hubbardhamiltonianwillbeintroducedandjustifiedasaneffectivedescriptionofsome relevantphysicalsystems(dilutealkaligasesinopticallattices,arraysofJosephsonjunctions).Iwill alsoshowameanfieldtheorysolutionandtheresultingphasediagram.Finally,Iwilldescribeindet...
supersolid phases. This assignment follows from a lowtmapping to disordered phases of the Spin-1 Blume-Capel model (See Supplemental Material). Figure 2 Schematic zero-temperature phase diagram. Schematic of the conventional zero temperature mean field phase diagram of Eq. (1) at density below ...
The pursuit of superconducting-based quantum computers has advanced the fabrication of and experimentation with custom lattices of qubits and resonators. Here, we describe a roadmap to use present experimental capabilities to simulate an interacting many
6) Hubbard-Hirsch model Hubbard-Hirsch模型 1. We made use of mean-field theory and green’s function technique to give and discuss the calculation results of the boundary conduction-electron energy and transverse magnetic susceptibility of one-dimensional Hubbard-Hirsch model. 应用平均场理论和...
We study the Mott phase of the Bose-Hubbard model on a tilted lattice. On the (Gutzwiller) mean-field level, the tilt has no effect -- but quantum fluctuations entail particle-hole pair creation via tunneling. For small potential gradients (long-wavelength limit), we derive a quantitative an...
We discuss some features of the dissipative quantum model of brain in the frame of the formalism of quantum dissipation. Such a formalism is based on the d... E Pessa,G Vitiello - 《International Journal of Modern Physics B》 被引量: 74发表: 2004年 Differences between mean-field dynamics ...