Andreev Band Inversion as the Origin of the Anomalous Seebeck Sign Change in Topological Josephson Junctions
An effective resonant-tunneling model (quantum dot renormalized by an induced superconducting gap, solved with the Keldysh nonequilibrium Green's-function technique) showing that the Andreev bound states on the dot invert (electron and hole orbitals exchange roles) when the Josephson junction has p-wave rather than s-wave symmetry, and that this band inversion is the physical origin of the anomalous sign change of the Seebeck coefficient, giving a thermoelectric transport signature that distinguishes topological from trivial junctions.
Transport signatures of inverted Andreev bands in topological Josephson junctions Jonathan Sturm,1
Studies thermoelectric transport transverse to conventional (s-wave) and topological (p-wave) Josephson junctions containing a central quantum dot. The authors derive an effective resonant-tunneling …