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- W2912091545 abstract "We study the superfluid critical temperature in a two-band attractive Fermi system with strong pairing fluctuations associated with both interband and intraband couplings. We focus specifically on a configuration where the intraband coupling is varied from weak to strong in a shallow band coupled to a weakly-interacting deeper band. The whole crossover from the Bardeen-Cooper-Schrieffer (BCS) condensation of largely overlapping Cooper pairs to the Bose-Einstein condensation (BEC) of tightly bound molecules is covered by our analysis, which is based on the extension of the Nozi`{e}res-Schmitt-Rink (NSR) approach to a two-band system. In comparison with the single-band case, we find a strong enhancement of the critical temperature, a significant reduction of the preformed pair region where pseudogap effects are expected, and the entanglement of two kinds of composite bosons in the strong-coupling BEC regime." @default.
- W2912091545 created "2019-02-21" @default.
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- W2912091545 date "2019-05-28" @default.
- W2912091545 modified "2023-09-30" @default.
- W2912091545 title "Enhanced critical temperature, pairing fluctuation effects, and BCS-BEC crossover in a two-band Fermi gas" @default.
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- W2912091545 doi "https://doi.org/10.1103/physrevb.99.180503" @default.
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