Phys. Rev. A 67, 055601 (2003) [4 pages]Anomalous fluctuations of two-dimensional Bose-Einstein condensatesReceived 27 October 2002; revised 14 January 2003; published 28 May 2003 We investigate the particle-number fluctuations due to the collective excitations created in a two-dimensional (2D) and a quasi-2D Bose-Einstein condensates (BECs) at low temperature. We find that the fluctuations display an anomalous behavior, i.e., for the 2D BEC they are proportional to N2, where N is the total number of particles. For the quasi-2D BEC, the particle-number fluctuations are proportional not only to N2 but also to the square root of the trapping frequency in the strongly confined direction. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.67.055601
DOI:
10.1103/PhysRevA.67.055601
PACS:
03.75.Hh, 03.75.Kk, 05.30.Jp, 67.40.Db
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