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

Year: 2006

Authors: Carusotto I., Hu S.X., Collins L.A., Smerzi A.

Autors Affiliation: CNR-BEC-INFM, Trento, I-38050 Povo, Italy;
Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA

Abstract: 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.


Volume: 97 (26)      Pages from: 260403-1  to: 260403-4

KeyWords: BEC; Cerenkov radiation; phonons
DOI: 10.1103/PhysRevLett.97.260403

Citations: 116
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