Solitons in two-dimensional Bose-Einstein condensates

Year: 2008

Authors: Tsuchiya S., Dalfovo F., Pitaevskii L.

Autors Affiliation: Department of Physics, Keio University, Hiyoshi, Kohoku-ku, Yokohama Japan;
CREST(JST), Honcho, Saitama, Japan;
CNR INFM-BEC;
Dipartimento di Fisica, Universita’ di Trento;
Kapitza Institute for Physical Problems, Moscow, Russia

Abstract: The excitations of a two-dimensional (2D) Bose-Einstein condensate in the presence of a soliton are studied by solving the Kadomtsev-Petviashvili equation which is valid when the velocity of the soliton approaches the speed of sound. The excitation spectrum is found to contain states which are localized near the soliton and have a dispersion law similar to the one of the stable branch of transverse oscillations of a 1D gray soliton in a 2D condensate. By using the stabilization method we show that these localized excitations behave as resonant states coupled to the continuum of free excitations of the condensate.

Journal/Review: PHYSICAL REVIEW A

Volume: 77 (4)      Pages from: 045601-1  to: 045601-10

KeyWords: Ultracold gases; BEC;
DOI: 10.1103/PhysRevA.77.045601

Citations: 29
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