2011/12/31 by Sho Nakosai, Yukio Tanaka, Naoto Nagaosa · 1 citation
Physics and Astronomy · #cond-mat.supr-con #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.108.147003
published as Phys. Rev. Lett. 108, 147003 (2012) · 5 pages
arxiv created 2012/04/06 · arxiv updated 2012/04/09
We theoretically study a possible topological superconductivity in the interacting two layers of Rashba systems, which can be fabricated by the hetero-structures of semiconductors and oxides. The hybridization, which induces the gap in the single particle dispersion, and the electron-electron interaction between the two layers leads to the novel phase diagram of the superconductivity. It is found that the topological superconductivity \it without breaking time-reversal symmetry is realized when (i) the Fermi energy is within the hybridization gap, and (ii) the inter-layer interaction is repulsive, both of which can be satisfied in realistic systems. Edge channels are studied in a tight-binding model numerically, and the several predictions on experiments are also given.