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arXiv 1502.00402cond-mat.quant-gascond-mat.supr-conquant-ph
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超流玻色-费米混合物中的诱导相互作用

Induced interactions in a superfluid Bose-Fermi mixture

J. J. Kinnunen, G. M. Bruun

摘要:

我们分析了在整个BCS-BEC转换过程中,玻色-爱因斯坦凝聚体与超流双组分费米气体的混合。用准粒子无规相近似结合Beliaev理论分别描述费米超流和玻色-爱因斯坦凝聚,我们证明了费米气体的单粒子和集体激发引起玻色子之间的诱导相互作用,这种相互作用随动量和频率的变化而强烈变化.它发散的费米超流体的声音模式,导致在一个尖锐的避免交叉功能和相应的符号变化的相互作用能移动的激发谱的BEC。此外,费米超流体中准粒子的激发导致BEC中激发的阻尼。除了研究诱导相互作用本身,这些显著的效应可以用来系统地探测强相互作用的费米气体。

英文摘要:

We analyse a Bose-Einstein condensate (BEC) mixed with a superfluid two-component Fermi gas in the whole BCS-BEC cross-over. Using a quasiparticle random phase approximation combined with Beliaev theory to describe the Fermi superfluid and the BEC respectively, we show that the single particle and collective excitations of the Fermi gas give rise to an induced interaction between the bosons, which varies strongly with momentum and frequency. It diverges at the sound mode of the Fermi superfluid, resulting in a sharp avoided crossing feature and a corresponding sign change of the interaction energy shift in the excitation spectrum of the BEC. In addition, the excitation of quasiparticles in the Fermi superfluid leads to damping of the excitations in the BEC. Besides studying induced interactions themselves, these prominent effects can be used to systematically probe the strongly interacting Fermi gas.

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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