Low-dimensional weakly interacting Bose gases: Nonuniversal equations of state

被引：24

作者：

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

Boronat, J. ^{[1
]}

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

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

Mazzanti, F. ^{[1
]}

机构：

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

[2] Inst Spect, RU-142190 Troitsk, Moscow Region, Russia

来源：

PHYSICAL REVIEW A | 2010年 / 81卷 / 01期

关键词：

MANY-BODY PROBLEM; EINSTEIN CONDENSATION; GROUND-STATE; SYSTEM; FERMIONS;

D O I：

10.1103/PhysRevA.81.013612

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The zero-temperature equation of state is analyzed in low-dimensional bosonic systems. We propose to use the concept of energy-dependent s-wave scattering length for obtaining estimations of nonuniversal terms in the energy expansion. We test this approach by making a comparison to exactly solvable one-dimensional problems and find that the generated terms have the correct structure. The applicability to two-dimensional systems is analyzed by comparing with results of Monte Carlo simulations. The prediction for the nonuniversal behavior is qualitatively correct and the densities, at which the deviations from the universal equation of state become visible, are estimated properly. Finally, the possibility of observing the nonuniversal terms in experiments with trapped gases is also discussed.

引用

页数：10

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