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Competition between d-wave and topological p-wave superconducting phases in the doped Kitaev-Heisenberg model

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Khaliullin,  G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Hyart, T., Wright, A. R., Khaliullin, G., & Rosenow, B. (2012). Competition between d-wave and topological p-wave superconducting phases in the doped Kitaev-Heisenberg model. Physical Review B, 85(14): 140510(R).


Cite as: https://hdl.handle.net/21.11116/0000-000E-C5AF-F
Abstract
The competition between Kitaev and Heisenberg interactions away from half filling is studied for the hole-doped Kitaev-Heisenberg t-J(K)-J(H) 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 J(H) < J(K)/2. Within the p-wave superconducting phase, a critical chemical potential |mu| = mu(c) approximate to t separates a topologically trivial phase for |mu| < mu(c) from a topologically nontrivial Z(2) time-reversal invariant spin-triplet phase for |mu| > mu(c).