Induced superconductivity in Fermi arcs
Z. Faraei, S. A. Jafari
DOI 10.1103/PhysRevB.100.035447 · Physical Review B
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Abstract
When the interface of a superconductor (SC) with a Weyl semimetal (WSM) supports Fermi arcs, the chirality blockade eliminates the induction of superconductivity into the bulk of time-reversal symmetry (TRS) breaking WSM. This leaves the Fermi arc states as the only low-energy degrees of freedom in the proximity problem. Therefore the SC|WSM system will be a platform to probe transport properties which involve only the Fermi arcs. With a boundary condition that flips the spin at the boundary, we find a Z2 protected Bogoliubov Fermi contour (BFC) around which the Bogoliubov quasiparticles disperse linearly. The resulting BFC and excitations around it leave a distinct T2 temperature dependence in their contribution to specific heat. Furthermore, the topologically protected BFC being a Majorana Fermi surface gives rise to a zero-bias peak, the strength of which characteristically depends on the length of Fermi arc and tunneling strength. For the other BC that flips the chirality at the interface, instead of BFCs, we have Bogoliubov-Weyl nodes whose location depends on the tunneling strength.
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