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 language | English |
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Article number | 140509 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 80 |
Issue number | 14 |
DOIs | |
Publication status | Published - Oct 20 2009 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics