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arXiv:cond-mat/0611104 · Physica C Superconductivity

What can ultracold Fermi gases teach us about high Tc superconductors and vice versa?

Kathryn Levin, Qijin Chen

Published Mar 31, 2007• 0 citations
arXivHTMLPDF
DOI
10.1016/j.physc.2007.03.293

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The Bose-Einstein condensate to Bardeen-Cooper-Schrieffer crossover in ultracold Fermi gases creates an ideal environment to enrich our knowledge of many-body systems. It is relevant to a wide range of fields from condensed matter to astrophysics. The nature of pairing in strongly interacting Fermi gases can be readily studied. This aids our understanding of related problems in high-Tc superconductors, whose mechanism is still under debate due to the large interaction parameter. Here, we calculate the dynamical properties of a normal, trapped strongly correlated Fermi gas, by developing a quantum cluster expansion. Our calculations for the single-particle spectral function agree with recent rf spectroscopy measurements, and clearly demonstrate pseudogap pairing in the strongly interacting regime.