Anomalous surface states at interfaces in p-wave superconductors

S. V. Bakurskiy, A. A. Golubov, M. Yu. Kupriyanov, K. Yada, and Y. Tanaka
Phys. Rev. B 90, 064513 – Published 22 August 2014

Abstract

We present the results of theoretical study of surface state properties in a two-dimensional model for triplet p-wave superconductors. We derive boundary conditions for Eilenberger equations at rough interfaces and develop the approach for self-consistent solution for the spatial dependence of px- and px+ipy-wave pair potentials. In the px case we demonstrate the robustness of the zero-energy peak in the density of states (DoS) with respect to surface roughness, in contrast to the suppression of such a peak in the case of dxy symmetry. This effect is due to stability of odd-frequency pairing state at the surface with respect to disorder. In the case of the chiral px+ipy state we demonstrate the appearance of a complex multipeak subgap structure in the spectrum with increasing surface roughness.

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  • Received 6 June 2014
  • Revised 5 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.064513

©2014 American Physical Society

Authors & Affiliations

S. V. Bakurskiy1,2,3, A. A. Golubov2,3, M. Yu. Kupriyanov2,4, K. Yada5, and Y. Tanaka2,5

  • 1Faculty of Physics, Lomonosov Moscow State University, 119992 Leninskie Gory, Moscow, Russia
  • 2Moscow Institute of Physics and Technology, Dolgoprudny, Moscow 141700, Russia
  • 3Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
  • 4Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University (SINP MSU), Leninskie Gory, GSP-1, Moscow 119991, Russia
  • 5Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan

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Issue

Vol. 90, Iss. 6 — 1 August 2014

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