Topological superconductivity in the Kondo-Kitaev model

ORAL

Abstract

We investigate possible topological superconductivity in the Kondo-Kitaev model on the honeycomb lattice, where the Kitaev spin liquid is coupled to conduction electrons via the Kondo coupling. The self-consistent mean-field theory gives three distinct quantum phases as the Kondo coupling is increased: the fractionalized Fermi liquid, where the Kitaev spin liquid and conduction electrons remain decoupled, the ferromagnetic topological superconductor with a single chiral Majorana edge mode, and the paramagnetic topological superconductor with a single pair of helical Majorana edge modes. In this talk, we discuss the connection between topological nature of the Kitaev spin liquid and two emergent topological superconductors obtained in this model. These findings offer a novel route to topological superconductivity in the Kondo lattice system.

*This work was supported by the NSERC of Canada and Center for Quantum Materials at the University of Toronto (W.C. and Y.B.K.), and DFG Project C02 of CRC1238 (P.W.K. and A.R.). P.W.K. acknowledges support from the German Academic Scholarship Foundation and the Bonn-Cologne Graduate School of Physics and Astronomy (BCGS).

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Presenters

  • Wonjune Choi

    • Physics, University of Toronto

Authors

  • Wonjune Choi

    • Physics, University of Toronto

  • Philipp Wilhelm Klein

    • Physics, University of Cologne

  • Achim Rosch

    • University of Cologne
    • Physics, University of Cologne

  • Yong-Baek Kim

    • Department of Physics, University of Toronto
    • Department of Physics and Centre for Quantum Materials, University of Toronto
    • Physics, University of Toronto