期刊
PHYSICAL REVIEW A
卷 82, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.82.023613
关键词
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资金
- Agence Nationale de la Recherche [ANR-07-BLAN-0162-02]
- Region Ile-de-France (Programme Regional SETCI)
- Institut Francilien de Recherche sur les Atomes Froids
- Federation Lumiere-Matiere du CNRS
- Agence Nationale de la Recherche (ANR) [ANR-07-BLAN-0162] Funding Source: Agence Nationale de la Recherche (ANR)
We investigate theoretically an original route to achieve Bose-Einstein condensation using dark power-law laser traps. We propose to create such traps with two crossing blue-detuned Laguerre-Gaussian optical beams. Controlling their azimuthal order l allows for the exploration of a multitude of power-law trapping situations in one, two, and three dimensions, ranging from the usual harmonic trap to an almost square-well potential, in which a quasihomogeneous Bose gas can be formed. The usual cigar-shaped and disk-shaped Bose-Einstein condensates obtained in a 1D or 2D harmonic trap take the generic form of a finger or of a hockey puck in such Laguerre-Gaussian traps. In addition, for a fixed atom number, higher transition temperatures are obtained in such configurations when compared with a harmonic trap of the same volume. This effect, which results in a substantial acceleration of the condensation dynamics, requires a better but still reasonable focusing of the Laguerre-Gaussian beams.
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