Topological superconductivity in bilayer Rashba system

Details Topological superconductivity in bilayer Rashba system Topological superconductivity in bilayer Rashba system

2011-12-26

arxiv.org/abs/1112.5822v2

Phys. Rev. Lett. 108, 147003 (2012)

Physics

Condensed Matter

Superconductivity

5 pages

Scientific paper

10.1103/PhysRevLett.108.147003

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.

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