Multiple-gap structure in electric-field-induced surface superconductivity

Yousuke Mizohata, Masanori Ichioka, Kazushige Machida

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Abstract

Local superconducting gap structure is studied as a function of nanoscale depth in electric-field-induced surface superconductivity such as in SrTiO 3. We examine solutions of the Bogoliubov-de Gennes equation in two limiting confinement potential cases of an electric field with and without screening effects. As unique properties different from bulk superconductivity, there appear in-gap states even for isotropic s-wave pairing, due to the multiple-gap structure of sub-band-dependent surface superconductivity. These determine the depth dependence of local superconductivity.

Original languageEnglish
Article number014505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number1
DOIs
Publication statusPublished - Jan 11 2013

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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