DISORDERED BOSONS - CONDENSATE AND EXCITATIONS

被引：46

作者：

SINGH, KG

ROKHSAR, DS

机构：

[1] Department of Physics, University of California, Berkeley

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.49.9013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The disordered Bose-Hubbard model is studied numerically within the Bogoliubov approximation. First, the spatially varying condensate wave function in the presence of disorder is found by solving a nonlinear Schrodinger equation. Using the Bogoliubov approximation to find the excitations above this condensate, we calculate the condensate fraction, superfluid density, and density of states for a two-dimensional disordered system. These results are compared with experiments done with He-4 adsorbed in porous media.

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页码：9013 / 9023

页数：11

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