Hidden Pseudogap and Excitation Spectra in a Strongly Coupled Two-Band Superfluid/Superconductor

被引：1
作者：
Tajima, Hiroyuki [1 ]
Pieri, Pierbiagio [2 ,3 ]
Perali, Andrea [4 ]
机构：
[1] Kochi Univ, Dept Math & Phys, Kochi 7808520, Japan
[2] Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna, Italy
[3] Ist Nazl Fis Nucl, Sez Bologna, I-40127 Bologna, Italy
[4] Univ Camerino, Sch Pharm, Phys Unit, I-62032 Camerino, Italy
来源：
CONDENSED MATTER | 2021年 / 6卷 / 01期
关键词：
BCS-BEC crossover; pseudogap; spectral function; multiband superconductor; multicomponent superfluids; FESHBACH RESONANCE; SUPERCONDUCTIVITY; TEMPERATURE; FESE; BCS; FLUCTUATIONS; BULK;
D O I：
10.3390/condmat6010008
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
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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页数：9
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