Effect of Time Reversal Symmetry Breaking on the Density of States in Small Superconducting Grains

I. S. Beloborodov, B. N. Narozhny, and I. L. Aleiner
Phys. Rev. Lett. 85, 816 – Published 24 July 2000
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Abstract

We show that in ultrasmall superconducting grains any concentration of magnetic impurities or infinitely small orbital effect of magnetic field leads to destruction of the hard gap in the tunneling density of states, and find analytically the exponential tail at low energies. Thus, the tunneling density of states exhibits the “soft gap” behavior. As the energy approaches zero, it vanishes linearly with excitation energy.

  • Received 13 December 1999

DOI:https://doi.org/10.1103/PhysRevLett.85.816

©2000 American Physical Society

Authors & Affiliations

I. S. Beloborodov1, B. N. Narozhny2,3, and I. L. Aleiner2,3

  • 1Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany
  • 2Department of Physics and Astronomy, SUNY Stony Brook, Stony Brook, New York 11794
  • 3Centre for Advanced Studies, Drammensveien 78, N-0271 Oslo, Norway

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Vol. 85, Iss. 4 — 24 July 2000

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