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29 March 2024
 
  » arxiv » 1308.2496

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Symmetry-protected topological invariant and Majorana impurity states in time-reversal invariant superconductors
Lukas Kimme ; Timo Hyart ; Bernd Rosenow ;
Date 12 Aug 2013
AbstractWe address the question of whether individual nonmagnetic impurities can induce zero-energy states in time reversal invariant topological superconductors, and define a class of symmetries which indeed guarantee the existence of such states for a specific value of the impurity strength. These symmetries also allow the definition of a position space topological Z_2 invariant, which is related to the standard bulk topological Z_2 invariant. Our general results are then applied to the time reversal invariant p-wave phase of the doped Kitaev-Heisenberg model, where we also demonstrate how a lattice of impurities can drive a topologically trivial system into the non-trivial phase. Finally, signatures of impurity states in the spin-susceptibility are described.
Source arXiv, 1308.2496
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