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Article overview
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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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