Thermopower of three-terminal topological superconducting systems

Abstract

We study the thermopower of a three-terminal setup composed of a quantum dot attached to three electrodes, one of which is a topological superconductor. In the model, superconductivity is explicitly taken into account. We compare the results for s-wave (trivial) and p-wave (topological) superconductors and observe that for small temperatures the thermopower has different sign in the two cases. This behavior is strongly dependent on temperature and we estimate an energy scale that controls the sign in the p-wave case, which results proportional to the square root of the gap and the coupling to superconductor. The analytical results obtained with a simple 1D model are confirmed by a more realistic tight-binding model.

arXiv comment10 pages, 15 figures, published version

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• Thermoelectric transport through Majorana bound states and violation of Wiedemann-Franz law
• Spin-dependent thermoelectric phenomena in a quantum dot attached to ferromagnetic and superconducting electrodes
• Tuning of heat and charge transport by Majorana fermions
• Local and non-local thermopowers in three-terminal nanostructures
• Nanowire-based thermoelectric ratchet in the hopping regime
• Probing Majorana-like states in quantum dots and quantum rings
• Symmetry conditions of a nodal superconductor for generating robust flat-band Andreev bound states at its dirty surface
• Majorana-mediated thermoelectric transport in multiterminal junctions
• Thermoelectric processes of quantum normal-superconductor interfaces
• Nonlocal thermoelectricity in quantum wires as a signature of Bogoliubov-Fermi points
• Transport across a system with three p-wave superconducting wires: effects of Majorana modes and interactions
• Transport signatures of inverted Andreev bands in topological Josephson junctions
• Properties of multiterminal superconducting nanostructure with double quantum dot