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arXiv 0909.5090quant-ph
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暗幂律laser阱中的玻色-爱因斯坦凝聚

Bose-Einstein condensation in dark power-law laser traps

Amine Jaouadi, Naceur Gaaloul, Bruno Viaris De Lesegno, Mourad Telmini, Laurence Pruvost, Eric Charron

摘要:

从理论上研究了利用暗幂律激光阱实现玻色-爱因斯坦凝聚的一条新途径。我们提出用两束交叉的蓝失谐拉盖尔-高斯光束来产生这样的陷阱。控制它们的方位角顺序$\ell$允许探索在一个,两个和三个维度,从通常的谐波陷阱几乎方阱势,其中可以形成准均匀的玻色气体的众多的幂律捕获的情况。在一维或二维谐波阱中获得的通常的雪茄形和盘形玻色-爱因斯坦凝聚体在这种拉盖尔-高斯阱中采取“手指”或“冰球”的一般形式。此外,对于一个固定的原子数,更高的转变温度时,在这样的配置相比,相同体积的谐波陷阱。这种效应导致凝聚动力学的显著加速,需要拉盖尔-高斯光束的更好但仍然合理的聚焦。

英文摘要:

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 $\ell$ 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 quasi-homogeneous 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 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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