Superfluidity versus Bose-Einstein condensation in a Bose gas with disorder

被引：76

作者：

Astrakharchik, GE ^{[1
]}

Boronat, J

Casulleras, J

Giorgini, S

机构：

[1] Univ Trent, Dipartimento Fis, I-38050 Trento, Italy

[2] Ist Nazl Fis Mat, I-38050 Trento, Italy

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

来源：

PHYSICAL REVIEW A | 2002年 / 66卷 / 02期

关键词：

D O I：

10.1103/PhysRevA.66.023603

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We investigate the phenomenon of Bose-Einstein condensation and superfluidity in a Bose gas at zero temperature with disorder. By using the diffusion Monte Carlo method, we calculate the superfluid and the condensate fraction of the system as a function of density and strength of disorder. In the regime of weak disorder we find agreement with the analytical results obtained within the Bogoliubov model. For strong disorder the system enters an unusual regime where the superfluid fraction is smaller than the condensate fraction.

引用

页码：1 / 4

页数：4