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arXiv 0907.1332cond-mat.quant-gas
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格点玻色子射频谱中的多体物理

Many-body physics in the radio frequency spectrum of lattice bosons

Kaden R. A. Hazzard, Erich J. Mueller

摘要:

我们计算了囚禁在光晶格中的冷玻色子原子云的射频谱。使用随机相位和局部密度近似,我们产生的陷阱平均和空间分辨光谱,识别简单的功能,揭示超流性和相关性的信息的光谱。当两个内部自旋态的跳跃率相等时,我们的方法在深Mott极限和深超流中是精确的。它包含终态相互作用,服从沃德恒等式(和相关的守恒律),并满足$f$求和规则。受Sun,Lannert和Vishveshwara [Phys.Rev.A \textbf{79},043422(2009)]早期工作的启发,我们还讨论了自旋相关光晶格中出现的特征。

英文摘要:

We calculate the radio-frequency spectrum of a trapped cloud of cold bosonic atoms in an optical lattice. Using random phase and local density approximations we produce both trap averaged and spatially resolved spectra, identifying simple features in the spectra that reveal information about both superfluidity and correlations. Our approach is exact in the deep Mott limit and in the deep superfluid when the hopping rates for the two internal spin states are equal. It contains final state interactions, obeys the Ward identities (and the associated conservation laws), and satisfies the $f$-sum rule. Motivated by earlier work by Sun, Lannert, and Vishveshwara [Phys. Rev. A \textbf{79}, 043422 (2009)], we also discuss the features which arise in a spin-dependent optical lattice.

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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