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arXiv 1203.4657cond-mat.quant-gas
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强相互作用费米气体的动态自旋响应

Dynamic spin response of a strongly interacting Fermi gas

S. Hoinka, M. Lingham, M. Delehaye, C. J. Vale

摘要:

利用布拉格光谱技术对强相互作用费米气体的动态自旋响应进行了实验研究。通过改变布拉格激光器的失谐量,我们表明,它是可能的,分别测量自旋和密度通道的响应。在低布拉格能量下,由于配对,自旋响应被抑制,而密度响应被增强。这些实验提供了第一个独立的测量自旋平行和自旋反平行的动态和静态的结构因素,并开辟了一个完整的研究在任何动量的结构因素。在高动量下,自旋反平行动力学结构因子显示出与$ω^{-5/2}$成比例的通用高频尾,其中$\hbar ω$是探针能量。

英文摘要:

We present an experimental investigation of the dynamic spin response of a strongly interacting Fermi gas using Bragg spectroscopy. By varying the detuning of the Bragg lasers, we show that it is possible to measure the response in the spin and density channels separately. At low Bragg energies, the spin response is suppressed due to pairing, whereas the density response is enhanced. These experiments provide the first independent measurements of the spin-parallel and spin-antiparallel dynamic and static structure factors and open the way to a complete study of the structure factors at any momentum. At high momentum the spin-antiparallel dynamic structure factor displays a universal high frequency tail, proportional to $ω^{-5/2}$, where $\hbar ω$ is the probe energy.

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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