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Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 19: Transport: Topological Insulators 2 (jointly with TT, MA)

HL 19.2: Talk

Monday, March 26, 2012, 15:15–15:30, H 3005

Competition between d-wave and topological p-wave superconductivity in the doped Kitaev-Heisenberg model — •Timo Hyart1, Anthony Wright1, Giniyat Khaliullin2, and Bernd Rosenow11Institut für Theoretische Physik, Universität Leipzig, D-04103, Leipzig, Germany — 2Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany

The competition between Kitaev and Heisenberg interactions away from half filling is studied for the hole-doped Kitaev-Heisenberg t-JK-JH model on a honeycomb lattice. While the isotropic Heisenberg coupling supports a time-reversal violating d-wave singlet state, we find that the Kitaev interaction favors a time-reversal invariant p-wave superconducting phase, which obeys the rotational symmetries of the microscopic model, and is robust for JH<JK/2. Within the p-wave superconducting phase, a critical chemical potential µct separates a topologically trivial phase for |µ|< µc from a topologically non-trivial Z2 time-reversal invariant spin-triplet phase for |µ|>µc.

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