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29 March 2024
 
  » arxiv » 1109.6681

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Competition between d-wave and topological p-wave superconductivity in the doped Kitaev-Heisenberg model
Timo Hyart ; Anthony R. Wright ; Giniyat Khaliullin ; Bernd Rosenow ;
Date 29 Sep 2011
AbstractThe competition between Kitaev and Heisenberg interactions away from half filling is studied for the 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 $mu_c approx t$ separates a topologically trivial phase for $|mu|< mu_c$ from a topologically non-trivial $Z_2$ time-reversal invariant spin-triplet phase for $|mu|>mu_c$.
Source arXiv, 1109.6681
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