Excitations and phase segregation in a two-component Bose-Einstein condensate with an arbitrary interaction

被引：34

作者：

Alexandrov, AS ^{[1
]}

Kabanov, VV

机构：

[1] Loughborough Univ Technol, Dept Phys, Loughborough LE11 3TU, Leics, England

[2] Josef Stefan Inst, Ljubljana 1001, Slovenia

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2002年 / 14卷 / 18期

关键词：

D O I：

10.1088/0953-8984/14/18/101

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Bogoliubov-de Gennes equations and the excitation spectrum of a two-component Bose-Einstein condensate (BEC) are derived with an arbitrary interaction between bosons, including long-range and short-range forces. Spectra of optical and acoustic plasmons (APs) are obtained. For the Coulomb interaction the AP has a quadratic long-wavelength dispersion in contrast with the linear dispersion in the normal-state two-component plasma. The nonconverting BEC mixture segregates into two phases for some two-body interactions. Gross-Pitaevskii equations are solved for the phase-segregated BEC. A possibility of boundary-surface and other localized excitations is studied.

引用

页码：L327 / L332

页数：6

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