Equation of state of a weakly interacting two-dimensional Bose gas studied at zero temperature by means of quantum Monte Carlo methods

被引：36

作者：

Astrakharchik, G. E. ^{[1
]}

Boronat, J. ^{[1
]}

Casulleras, J. ^{[1
]}

Kurbakov, I. L. ^{[2
]}

Lozovik, Yu. E. ^{[2
]}

机构：

[1] Univ Politecn Cataluna, Dept Fis & Engn Nucl, E-08034 Barcelona, Spain

[2] Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia

来源：

PHYSICAL REVIEW A | 2009年 / 79卷 / 05期

关键词：

boson systems; equations of state; many-body problems; Monte Carlo methods; perturbation theory; GROUND-STATE; SYSTEMS;

D O I：

10.1103/PhysRevA.79.051602

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The equation of state of a weakly interacting two-dimensional Bose gas is studied at zero temperature by means of quantum Monte Carlo methods. Going down to as low densities as na(2)proportional to 10(-100) permits us to obtain agreement on beyond mean-field level between predictions of perturbative methods and direct many-body numerical simulation, thus providing an answer to the fundamental question of the equation of state of a two-dimensional dilute Bose gas in the universal regime (i.e., entirely described by the gas parameter na(2)). We also show that the measure of the frequency of a breathing collective oscillation in a trap at very low densities can be used to test the universal equation of state of a two-dimensional Bose gas.

引用

页数：4

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