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arXiv 1111.4633cond-mat.quant-gasquant-ph
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受限p带玻色-爱因斯坦凝聚体

Confined p-band Bose-Einstein condensates

Fernanda Pinheiro, Jani-Petri Martikainen, Jonas Larson

备注：
13 pages, 8 figures
发表信息：
Phys. Rev. A 85, 033638 (2012)
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摘要：

本文研究了二维光学正方晶格p带上玻色原子在束缚势作用下的性质。使用平均场方法，我们展示了如何各向异性隧道的p带粒子的影响，通过表征的基态密度和原子状态之间的网站和原子味的相干性云凝聚原子。与通常基于局域密度近似的结果不同，原子密度可以变为各向异性。这种各向异性效应在弱原子-原子相互作用和弱晶格振幅的极限下特别明显，即当基态的性质主要由动能驱动时。我们还研究了陷阱如何影响非陷阱情况下的已知属性。特别是，我们专注于反铁磁涡旋antivortex秩序，这对于封闭系统的行为，被证明是在凝聚云的边缘消失。

英文摘要：

We study bosonic atoms on the p-band of a two dimensional optical square lattice in the presence of a confining trapping potential. Using a mean-field approach, we show how the anisotropic tunneling for p-band particles affects the cloud of condensed atoms by characterizing the ground state density and the coherence properties of the atomic states both between sites and atomic flavors. In contrast to the usual results based on the local density approximation, the atomic density can become anisotropic. This anisotropic effect is especially pronounced in the limit of weak atom-atom interactions and of weak lattice amplitudes, i.e. when the properties of the ground state are mainly driven by the kinetic energies. We also investigate how the trap influences known properties of the non-trapped case. In particular, we focus on the behavior of the anti-ferromagnetic vortex-antivortex order, which for the confined system, is shown to disappear at the edges of the condensed cloud.

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