Journal
CONDENSED MATTER
Volume 6, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/condmat6010008
Keywords
BCS-BEC crossover; pseudogap; spectral function; multiband superconductor; multicomponent superfluids
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Funding
- JSPS [17J03975, 18H05406]
- Grants-in-Aid for Scientific Research [18H05406] Funding Source: KAKEN
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This study investigates the single-particle excitation properties in the normal state of a two-band superconductor or superfluid, focusing on iron-based multiband superconductors and multicomponent fermionic superfluids. It shows how the pseudogap state in the shallow band is concealed by the deep band contribution throughout the two-band BCS-BEC crossover, potentially explaining the missing pseudogap in recent scanning tunneling microscopy experiments in FeSe superconductors.
We investigate single-particle excitation properties in the normal state of a two-band superconductor or superfluid throughout the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein-condensation (BEC) crossover, within the many-body T-matrix approximation for multichannel pairing fluctuations. We address the single-particle density of states and the spectral functions consisting of two contributions associated with a weakly interacting deep band and a strongly interacting shallow band, relevant for iron-based multiband superconductors and multicomponent fermionic superfluids. We show how the pseudogap state in the shallow band is hidden by the deep band contribution throughout the two-band BCS-BEC crossover. Our results could explain the missing pseudogap in recent scanning tunneling microscopy experiments in FeSe superconductors.
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