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arXiv 1108.1192cond-mat.quant-gascond-mat.str-el
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光晶格中Bose-Hubbard莫特绝缘体的膨胀

Expansion of Bose-Hubbard Mott insulators in optical lattices

Mark Jreissaty, Juan Carrasquilla, F. Alexander Wolf, Marcos Rigol

摘要:

我们研究了玻色莫特绝缘体在光晶格存在下,在关闭限制势后的膨胀。我们使用Gutzwiller平均场近似,并考虑两种不同的设置。在第一种情况下,膨胀被限制在一个方向上。我们表明,这导致了两个凝聚体的出现,以及定义动量,并认为这样的结构可以用来创建原子激光器的光晶格。在第二个设置中,我们研究莫特绝缘体,允许在晶格中的所有方向上扩展。在这种情况下,一个简单的凝聚被认为是发展内的平均场近似。然而,它的组成玻色子被发现填充许多非零动量模式。这两种现象的分析理解方面的确切色散关系的硬核限制。

英文摘要:

We study the expansion of bosonic Mott insulators in the presence of an optical lattice after switching off a confining potential. We use the Gutzwiller mean-field approximation and consider two different setups. In the first one, the expansion is restricted to one direction. We show that this leads to the emergence of two condensates with well defined momenta, and argue that such a construct can be used to create atom lasers in optical lattices. In the second setup, we study Mott insulators that are allowed to expand in all directions in the lattice. In this case, a simple condensate is seen to develop within the mean-field approximation. However, its constituent bosons are found to populate many nonzero momentum modes. An analytic understanding of both phenomena in terms of the exact dispersion relation in the hard-core limit is presented.

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