Electron pairing with gapless excitations in mixed double layers

Andreas Sinner, Yurii E. Lozovik, and Klaus Ziegler
Phys. Rev. B 104, 245124 – Published 15 December 2021

Abstract

We study the interlayer pairing states in layered systems of two different 2d electronic subsystems, one with relativistic linear and the other with nonrelativistic parabolic spectrum. The complex order parameter of the paired state has a two-component structure. We investigate the pairing state formation on the mean-field level, determine the critical interaction strength and evaluate the effective potential. The anisotropic three-band spectrum of quasiparticles depends explicitly on the phase difference of the order parameter components, rotates in momentum space as it changes, and exhibits the strong band deformation due to the pairing. The pairing leads to the fusion and hybridization of initially decoupled bands. The quasiparticle spectrum has the shape of deformed Dirac cones in the vicinity of the two touching points between neighboring bands. The density of states exhibits a number of specific features due to band deformation, such as a van Hove singularity.

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  • Received 28 July 2021
  • Revised 3 December 2021
  • Accepted 6 December 2021

DOI:https://doi.org/10.1103/PhysRevB.104.245124

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Andreas Sinner1, Yurii E. Lozovik2,3, and Klaus Ziegler1

  • 1Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany
  • 2Institute of Spectroscopy, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia
  • 3Moscow Institute of Electronics and Mathematics, National Research University, Higher School of Economics, 101000 Moscow, Russia

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Issue

Vol. 104, Iss. 24 — 15 December 2021

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