Bogoliubov-Cerenkov radiation in a Bose-Einstein condensate flowing against an obstacle

被引：123

作者：

Carusotto, I.

Hu, S. X. ^{[1
]}

Collins, L. A.

Smerzi, A.

机构：

[1] CNR, BEC, INFM, I-38050 Trento, Italy

[2] Los Alamos Natl Lab, Los Alamos, NM 87544 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.97.260403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the density modulation that appears in a Bose-Einstein condensate flowing with supersonic velocity against an obstacle. The experimental density profiles observed at JILA are reproduced by a numerical integration of the Gross-Pitaevskii equation and then interpreted in terms of Cerenkov emission of Bogoliubov excitations by the defect. The phonon and the single-particle regions of the Bogoliubov spectrum are, respectively, responsible for a conical wave front and a fan-shaped series of precursors.

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页数：4

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