腔中超冷玻色气体的扩展哈伯德模型  

Extended Hubbard Models of Ultracold Bosonic Gases in a Light-Cavity

作　　者：陈煌杰 郑东琛 余炎强 廖任远 CHEN Huangjie;ZHENG Dongchen;YU Yanqiang;LIAO Renyuan(Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials,College of Physics and Energy,Fujian Normal University,Fuzhou 350117,China)

机构地区：[1]福建师范大学物理与能源学院,福建省量子调控与新能源材料重点实验室,福建福州350117

出　　处：《山西大学学报（自然科学版）》2020年第2期299-303,共5页Journal of Shanxi University(Natural Science Edition)

基　　金：国家自然科学基金(11674058)。

摘　　要：最近的实验中,ETH小组成功地将玻色气体载入置于腔中的光晶格中,从而在实验上实现了带有长程相互作用的扩展哈伯德模型。文章基于自洽平均场和微扰法,分析了扩展哈伯德模型的量子相变。基态相图展示了带有CDW态的有趣图案。计算了Mott绝缘相到超流相的临界跃迁振幅和超流相到正常流体的临界温度。进一步研究了在固定化学势(μ=0.5)下超流的热力学性质,其显示了有限温下不同长程相互作用强度对体系的影响。Recent experiments in ETH had succeeded in loading bosonic atomic gases in optical lattices inside a cavity,which enabled the experimental realization of an extended Hubbard model with long-range interactions.We analyzed the quantum phases of extended Bose-Hubbard models in a light-cavity based on self-consistent mean field and perturbation methods.The ground-state phase diagrams exhibited interesting patterns with charge density wave.We calculated critical tunneling amplitude and temperature of order parameters for the Mott insulator-to-superfluid and superfluid-to-normal fluid transitions,respectively.Moreover,we further studied thermodynamic properties of the superfluid at fixed chemical potential(μ=0.5),which showed the effects of different long-range interaction strengths on the systems at finite temperature.

关 键 词：玻色-爱因斯坦凝聚态 扩展哈伯德模型 自洽平均场 长程相互作用 

分 类 号：O469[理学—凝聚态物理]