Fingerprint of topological Andreev bound states in phase-dependent heat transport
Björn Sothmann, Ewelina M. Hankiewicz
DOI 10.1103/PhysRevB.94.081407 · Physical Review B
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Abstract
We demonstrate that phase-dependent heat currents through superconductor-topological insulator Josephson junctions provide a useful tool to probe the existence of topological Andreev bound states, even for multichannel surface states. We predict that in the tunneling regime topological Andreev bound states lead to a minimum of the thermal conductance for a phase difference ϕ=π, in clear contrast to a maximum of the thermal conductance at ϕ=π that occurs for trivial Andreev bound states in superconductor–normal-metal tunnel junctions. This opens up the possibility that phase-dependent heat transport can distinguish between topologically trivial and nontrivial 4π modes. Furthermore, we propose a superconducting quantum interference device geometry where phase-dependent heat currents can be measured using available experimental technology.
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