We show that Majorana edge modes of two-dimensional spin-triplet topological superconductors (superfluids) have Ising-type spin density whose direction is determined by the d-vector characterizing the spin-triplet pairing symmetry. Exchange coupling between an impurity spin (S=1/2) and Majorana edge modes is thus Ising-type. Under external magnetic field perpendicular to the Ising axis, the system can be mapped to a two-level system with Ohmic dissipation, which is equivalent to the anisotropic Kondo model. The magnetic response of the impurity spin can serve as a local experimental probe for the order parameter.
机构:
Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA
Univ Calif Santa Barbara, Stn Q, Santa Barbara, CA 93106 USAUniv Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA
Cheng, Meng
Tu, Hong-Hao
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Max Planck Inst Quantum Opt, D-85748 Garching, GermanyUniv Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA