Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 42: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 2

TT 42.13: Talk

Wednesday, March 22, 2017, 12:45–13:00, HSZ 304

Topological Superconductivity in the Extended Kitaev-Heisenberg Model — •Johann Schmidt, Tomas Löthman, and Annica M. Black-Schaffer — Uppsala Universitet, Uppsala, Schweden

We extend the discussion of superconductivity in the Kitaev-Heisenberg model by taking into account the recently proposed symmetric off-diagonal exchange term Γ. The new interaction term contributes further to the triplet superconductivity triggered by the Kitaev exchange. While a positive Γ bolsters the already reported time-reversal symmetric p-wave state with its transition to a topologically non-trivial state at high doping levels, new superconducting orders emerge for negative values of Γ. Of particular interest is a region at intermediate doping which breaks time-reversal symmetry and can be classified by a Chern number of ± 2.