Phys. Rev. Lett. 87, 140403 (2001) [4 pages]Structural Instability of Vortices in Bose-Einstein Condensates |
Juan J. García-Ripoll1, Gabriel Molina-Terriza2, Víctor M. Pérez-García1, and Lluis Torner2
1Departamento de Matemáticas, E.T.S.I. Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
2Laboratory of Photonics, Department of Signal Theory and Communications, Universitat Politécnica de Catalunya, Jordi Girona 1, UPC-D3, Barcelona, ES 08034, Spain
Received 4 April 2001; revised 14 June 2001; published 14 September 2001
In this paper we study a gaseous Bose-Einstein condensate and show the following: (i) A minimum value of the interaction is needed for the existence of stable persistent currents. (ii) Vorticity is not a fundamental invariant of the system, as there exists a conservative mechanism which can destroy a vortex and change its sign. (iii) This mechanism is suppressed by strong interactions.
©2001 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v87/e140403
DOI: 10.1103/PhysRevLett.87.140403
PACS: 03.75.Fi, 05.30.Jp, 67.57.De, 67.57.Fg
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