Two-dimensional dipolar Bose gas with the roton-maxon excitation spectrum

被引：59

作者：

Boudjemaa, Abdelaali ^{[1
,2
,3
]}

Shlyapnikov, G. V. ^{[2
,3
,4
]}

机构：

[1] Hassiba Benbouali Univ Chlef, Dept Phys, Fac Sci, Chlef 02000, Algeria

[2] CNRS, Lab Phys Theor & Modeles Stat, F-91405 Orsay, France

[3] Univ Paris 11, UMR8626, F-91405 Orsay, France

[4] Univ Amsterdam, Van der Waals Zeeman Inst, NL-1098 XH Amsterdam, Netherlands

来源：

PHYSICAL REVIEW A | 2013年 / 87卷 / 02期

关键词：

D O I：

10.1103/PhysRevA.87.025601

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We discuss fluctuations in a dilute two-dimensional Bose-condensed dipolar gas, which has a roton-maxon character of the excitation spectrum. We calculate the density-density correlation function, fluctuation corrections to the chemical potential, compressibility, and normal (superfluid) fraction. It is shown that the presence of the roton strongly enhances fluctuations of the density, and we establish the validity criterion of the Bogoliubov approach. At T = 0 the condensate depletion becomes significant if the roton minimum is sufficiently close to 0. At finite temperatures exceeding the roton energy, the effect of thermal fluctuations is stronger and it may lead to a large normal fraction of the gas and compressibility. DOI: 10.1103/PhysRevA.87.025601

引用

页数：5

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