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Title: Anomalous density of states in multiband superconductors near the Lifshitz transition

Abstract

We consider a multiband metal with deep primary bands and a shallow secondary one. In the normal state the system undergoes Lifshitz transition when the bottom of the shallow band crosses the Fermi level. In the superconducting state Cooper pairing in the shallow band is induced by the deep ones. As a result, the density of electrons in the shallow band remains finite even when the bottom of the band is above the Fermi level. We study the density of states in the system and find qualitatively different behaviors on the two sides of the Lifshitz transition. On one side of the transition the density of states diverges at the energy equal to the induced gap, whereas on the other side it vanishes. We argue that this physical picture describes the recently measured gap structurein shallow bands of iron pnictides and selenides.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1396255
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 14; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Koshelev, A. E., and Matveev, K. A. Anomalous density of states in multiband superconductors near the Lifshitz transition. United States: N. p., 2014. Web. doi:10.1103/PhysRevB.90.140505.
Koshelev, A. E., & Matveev, K. A. Anomalous density of states in multiband superconductors near the Lifshitz transition. United States. doi:10.1103/PhysRevB.90.140505.
Koshelev, A. E., and Matveev, K. A. Wed . "Anomalous density of states in multiband superconductors near the Lifshitz transition". United States. doi:10.1103/PhysRevB.90.140505.
@article{osti_1396255,
title = {Anomalous density of states in multiband superconductors near the Lifshitz transition},
author = {Koshelev, A. E. and Matveev, K. A.},
abstractNote = {We consider a multiband metal with deep primary bands and a shallow secondary one. In the normal state the system undergoes Lifshitz transition when the bottom of the shallow band crosses the Fermi level. In the superconducting state Cooper pairing in the shallow band is induced by the deep ones. As a result, the density of electrons in the shallow band remains finite even when the bottom of the band is above the Fermi level. We study the density of states in the system and find qualitatively different behaviors on the two sides of the Lifshitz transition. On one side of the transition the density of states diverges at the energy equal to the induced gap, whereas on the other side it vanishes. We argue that this physical picture describes the recently measured gap structurein shallow bands of iron pnictides and selenides.},
doi = {10.1103/PhysRevB.90.140505},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 14,
volume = 90,
place = {United States},
year = {2014},
month = {10}
}

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