Effect of the BCS supercurrent on the spontaneous surface flow in unconventional superconductivity with broken time-reversal-symmetry

Yoshikatsu Kusama, Yoji Ohashi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A spontaneous surface current state is investigated in unconventional superconductivity with broken time-reversal-symmetry. It is shown that a BCS supercurrent lowers the energy of the system in this state. The lowest state has zero total current; it satisfies the Bloch theorem which states absence of the total current in any stable state with no external field. We also show that the magnitude and the direction of the spontaneous current are strongly affected by the detail of the Fermi surface. We explain this effect in connection with a low-energy bound state near the surface originating from the anisotropy of the order parameter.

Original languageEnglish
Pages (from-to)987-993
Number of pages7
JournalJournal of the Physical Society of Japan
Volume68
Issue number3
Publication statusPublished - 1999 Mar
Externally publishedYes

Fingerprint

superconductivity
symmetry
Fermi surfaces
theorems
anisotropy
energy

Keywords

  • BCS supercurrent
  • Bloch theorem
  • d-wave superconductivity
  • Spontaneous surface current
  • Time-reversal symmetry breaking

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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AU - Ohashi, Yoji

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N2 - A spontaneous surface current state is investigated in unconventional superconductivity with broken time-reversal-symmetry. It is shown that a BCS supercurrent lowers the energy of the system in this state. The lowest state has zero total current; it satisfies the Bloch theorem which states absence of the total current in any stable state with no external field. We also show that the magnitude and the direction of the spontaneous current are strongly affected by the detail of the Fermi surface. We explain this effect in connection with a low-energy bound state near the surface originating from the anisotropy of the order parameter.

AB - A spontaneous surface current state is investigated in unconventional superconductivity with broken time-reversal-symmetry. It is shown that a BCS supercurrent lowers the energy of the system in this state. The lowest state has zero total current; it satisfies the Bloch theorem which states absence of the total current in any stable state with no external field. We also show that the magnitude and the direction of the spontaneous current are strongly affected by the detail of the Fermi surface. We explain this effect in connection with a low-energy bound state near the surface originating from the anisotropy of the order parameter.

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KW - Time-reversal symmetry breaking

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