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Angular momentum of a brane-world model

ISSN号：1674-1137
期刊名称：Chinese Physics C
时间：0
页码：865-867
语言：英文
分类：O437[机械工程—光学工程;理学—光学;理学—物理] O572.2[理学—粒子物理与原子核物理;理学—物理]
作者机构：[1]Center for Theoretical Physics, Department of Physics, Capital Normal University, Beijing 100048, China
相关基金：Supported by the National Natural Science Foundation of China under Grant Nos.10904096,10604024,11474025; the Natural Science Foundation of Beijing under Grant No.1092009 We are very grateful to Xue-Feng Zhang for providing the codes of the CSSE algorithm.
相关项目：多带超导和多分量玻色-爱因斯坦凝聚体中的新拓扑态

关键词：光学超晶格, 玻色子, 硬核, 二维, 量子涨落, 广场, 计算结果, 电荷密度波, hard-core bosons, spin-wave approximation

中文摘要：

In this work,we theoretically study hard-core bosons on a two-dimensional square optical superlattice at T = 0.First of all,we present the mean field phase diagram of this model in terms of the chemical potential μ and the alternating potential strength △.Besides a superfluid(SF) phase at △ = 0 and a charge density wave(CDW)phase in the large △ at half filling,we demonstrate that a supersolid(SS) phase emerges in the moderate △.Then,we focus on the μ = 0,e.g.,half filling case,using large-S semi-classical spin-wave approximation to study the SS to CDW quantum phase transition.In particular,we calculate the ground-state energy and the superfluid density at the level of1/S correction.We then compare the spin-wave results with the large scale quantum Monte Carlo(QMC) simulations using the cluster stochastic series expansion(CSSE) algorithm,and find that while the spin wave method is intuitive with clear physical pictures,the quantum critical point is quite different from that of numerical results which is believed to be accurate.We suggest that as simple as it is,this model still exhibits strong quantum fluctuations near the quantum critical point beyond the power of semiclassical spin-wave approach.

英文摘要：

In this work,we theoretically study hard-core bosons on a two-dimensional square optical superlattice at T = 0.First of all,we present the mean field phase diagram of this model in terms of the chemical potential μ and the alternating potential strength △.Besides a superfluid（SF） phase at △ = 0 and a charge density wave（CDW）phase in the large △ at half filling,we demonstrate that a supersolid（SS） phase emerges in the moderate △.Then,we focus on the μ = 0,e.g.,half filling case,using large-S semi-classical spin-wave approximation to study the SS to CDW quantum phase transition.In particular,we calculate the ground-state energy and the superfluid density at the level of1/S correction.We then compare the spin-wave results with the large scale quantum Monte Carlo（QMC） simulations using the cluster stochastic series expansion（CSSE） algorithm,and find that while the spin wave method is intuitive with clear physical pictures,the quantum critical point is quite different from that of numerical results which is believed to be accurate.We suggest that as simple as it is,this model still exhibits strong quantum fluctuations near the quantum critical point beyond the power of semiclassical spin-wave approach.

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