paper

Odd-Parity Topological Superconductors: Theory and Application to CuBiSe

arXiv:0912.3294 · doi:10.1103/PhysRevLett.105.097001

Abstract

Topological superconductors have been theoretically predicted as a new class of time-reversal-invariant superconductors which are fully gapped in the bulk but have protected gapless surface Andreev bound states. In this work, we provide a simple criterion that directly identifies this topological phase in \textit{odd-parity} superconductors. We next propose a two-orbital pairing model for the newly discovered superconductor CuBiSe%. Due to its peculiar three-dimensional Dirac band structure, we find that an inter-orbital triplet pairing with odd-parity is favored in a significant part of the phase diagram, and therefore gives rise to a topological superconductor phase. Finally we propose sharp experimental tests of such a pairing symmetry.

4.1 pages, 2 figures

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