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Quantum fluctuations and density of states in low-dimensional superconductors

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Abstract

We investigate the influence of quantum phase fluctuations on electron density of states (DOS) in ultrathin superconducting films and nanowires. Using an effective action approach we derive a non-perturbative correction to DOS in such systems. The main effect of phase fluctuations in quasi-two-dimensional films is the appearance of electron states at subgap energies while in quasi-one-dimensional nanowires fluctuations also lead to smearing of the gap edge singularity in DOS.

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Authors and Affiliations

  1. I.E. Tamm Department of Theoretical Physics, P.N. Lebedev Physical Institute, 119991, Moscow, Russia

    Alexey A. Radkevich, Andrew G. Semenov & Andrei D. Zaikin

  2. National Research University Higher School of Economics, 101000, Moscow, Russia

    Andrew G. Semenov

  3. Institute of Nanotechnology, Karlsruhe Institute of Nanotechnology (KIT), 76021, Karlsruhe, Germany

    Andrei D. Zaikin

Authors
  1. Alexey A. Radkevich
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  2. Andrew G. Semenov
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  3. Andrei D. Zaikin
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Correspondence to Alexey A. Radkevich.

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Radkevich, A.A., Semenov, A.G. & Zaikin, A.D. Quantum fluctuations and density of states in low-dimensional superconductors. Eur. Phys. J. Spec. Top. 227, 2289–2295 (2019). https://doi.org/10.1140/epjst/e2018-800046-x

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  • DOI: https://doi.org/10.1140/epjst/e2018-800046-x

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