• Editors' Suggestion
  • Rapid Communication

Anomalous density of states in multiband superconductors near the Lifshitz transition

A. E. Koshelev and K. A. Matveev
Phys. Rev. B 90, 140505(R) – Published 24 October 2014

Abstract

We consider a multiband metal with deep primary bands and a shallow secondary one. In the normal state the system undergoes a 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 an energy equal to the induced gap, whereas on the other side it vanishes. We argue that this physical picture describes the recently measured gap structure in shallow bands of iron pnictides and selenides.

  • Figure
  • Figure
  • Received 14 August 2014
  • Revised 7 October 2014

DOI:https://doi.org/10.1103/PhysRevB.90.140505

©2014 American Physical Society

Authors & Affiliations

A. E. Koshelev and K. A. Matveev

  • Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 90, Iss. 14 — 1 October 2014

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×