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arXiv 1012.0820cond-mat.quant-gascond-mat.supr-con
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极化费米气体中赝能隙的演化

Evolution of the Pseudogap in a polarized Fermi gas

Erich J. Mueller

摘要:

本文在T-矩阵近似下计算了正常(非超流)两组分费米子气体在BCS-BEC交叉中的单粒子谱密度。我们回顾了非凝聚对如何导致光谱密度让人想起有序状态,并探讨了如何在光谱中的间隙状功能的演变,因为一个改变气体的极化。当气体被极化时,我们发现这个赝能隙变得更加分散,并远离费米能级,这反映了这样一个事实,即存在的电子对较少,但它们仍然在激发中起着重要作用。

英文摘要:

We calculate the single particle spectral density of a normal (non-superfluid) two component gas of fermions in the BCS-BEC crossover within a T-matrix approximation. We review how non-condensed pairs lead to a spectral density reminiscent of the ordered state, and explore how a gap-like feature in the spectrum evolves as one changes the polarization of the gas. As the gas is polarized we find that this pseudogap becomes more diffuse and moves away from the Fermi level, reflecting the fact that fewer pairs are present but that they still play an important role in the excitations.

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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