Electrically controlled superconducting states at the heterointerface SrTiO3/LaAlO3
Keiji Yada, Seiichiro Onari, Yukio Tanaka, Jun-ichiro Inoue
DOI 10.1103/PhysRevB.80.140509 · Physical Review B
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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 Éliashberg 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrTiO3/LaAlO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.2 | Pressure not reported | unknown |
| SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure not reported | unknown |
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