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arXiv 0707.4444cond-mat.stat-mechcond-mat.dis-nn
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强无序势阱中的玻色-爱因斯坦凝聚体

Bose-Einstein Condensates in Strongly Disordered Traps

T. Nattermann, V. L. Pokrovsky

摘要:

本文从理论上考虑了由简谐势和随机势叠加而成的外势中的玻色-爱因斯坦凝聚体。从半定量分析,我们发现的大小,形状和激发能作为无序强度的函数。对于正散射长度和足够强的无序度,凝聚体衰变成大小为拉金长度${\cal L}$的碎片。这种状态在很大的粒子数范围内是稳定的。呼吸模式的频率按比例缩放为$1/{\cal L}^2$。对于负散射长度,尺寸为${\cal L}$的凝聚体可以作为亚稳态存在。这些发现被推广到各向异性陷阱。

英文摘要:

A Bose-Einstein condensate in an external potential consisting of a superposition of a harmonic and a random potential is considered theoretically. From a semi-quantitative analysis we find the size, shape and excitation energy as a function of the disorder strength. For positive scattering length and sufficiently strong disorder the condensate decays into fragments each of the size of the Larkin length ${\cal L}$. This state is stable over a large range of particle numbers. The frequency of the breathing mode scales as $1/{\cal L}^2$. For negative scattering length a condensate of size ${\cal L}$ may exist as a metastable state. These finding are generalized to anisotropic traps.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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