Electrically controlled superconducting states at the heterointerface SrTiO3/LaAlO3

Keiji Yada, Seiichiro Onari, Yukio Tanaka, Jun Ichiro Inoue

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

We study the symmetry of Cooper pair in a two-dimensional Hubbard model with the Rashba-type spin-orbit interaction as a minimal model of electron gas generated at a heterointerface of SrTiO3/LaAlO3. Solving the Iliashberg equation based on the third-order perturbation theory, we find that the gap function consists of the mixing of the spin-singlet dxy -wave component and the spin-triplet (px ±ipy) -wave one due to the broken inversion symmetry originating from the Rashba-type spin-orbit interaction. The ratio of the d -wave and the p -wave component continuously changes with the carrier concentration. We propose that the pairing symmetry is controlled by tuning the gate voltage.

Original languageEnglish
Article number140509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number14
DOIs
Publication statusPublished - Oct 20 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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