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arXiv 1005.5488cond-mat.quant-gas
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Gross-Pitaevskii方程的动力学解

Kinetic Thomas-Fermi solutions of the Gross-Pitaevskii equation

M. Ölschläger, G. Wirth, C. Morais Smith, A. Hemmerich

摘要:

在忽略动能的情况下得到的Gross-Pitaevskii(GP)方程的近似解被称为Gross-Fermi解。它们的特点是由碰撞能补偿局部势。在这篇文章中,我们考虑GP-方程的精确解与此属性和明确的值的动能,这表明术语“动力学费米子”(KTF)的解决方案。我们指出,一个大类的光移电位产生KTF-解决方案。作为基本的例子,我们考虑了一维和二维光晶格的情况下,通过叠加的两个,三个和四个激光束,并讨论了相应的KTF-解决方案的稳定性。本文提出了一种利用时间调制光移势激发二维KTF解的一般方法。

英文摘要:

Approximate solutions of the Gross-Pitaevskii (GP) equation, obtained upon neglection of the kinetic energy, are well known as Thomas-Fermi solutions. They are characterized by the compensation of the local potential by the collisional energy. In this article we consider exact solutions of the GP-equation with this property and definite values of the kinetic energy, which suggests the term "kinetic Thomas-Fermi" (KTF) solutions. We point out that a large class of light-shift potentials gives rise to KTF-solutions. As elementary examples, we consider one-dimensional and two-dimensional optical lattice scenarios, obtained by means of the superposition of two, three and four laser beams, and discuss the stability properties of the corresponding KTF-solutions. A general method is proposed to excite two-dimensional KTF-solutions in experiments by means of time-modulated light-shift potentials.

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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