Topological superconductivity in bilayer Rashba system

Abstract

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.

5 pages

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• Surface spectral function in the superconducting state of a topological insulator
• Quantum impurity spin in Majorana edge fermions
• Tunneling between Two Helical Superconductors via Majorana Edge Channels

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