Chirality blockade of Andreev reflection in a magnetic Weyl semimetal
N. Bovenzi, M. Breitkreiz, P. Baireuther, T. E. O'Brien, J. Tworzydło, İ. Adagideli, C. W. J. Beenakker
DOI 10.1103/PhysRevB.96.035437 · Physical Review B
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Abstract
A Weyl semimetal with broken time-reversal symmetry has a minimum of two species of Weyl fermions, distinguished by their opposite chirality, in a pair of Weyl cones at opposite momenta ±K that are displaced in the direction of the magnetization. Andreev reflection at the interface between a Weyl semimetal in the normal state (N) and a superconductor (S) that pairs ±K must involve a switch of chirality, otherwise it is blocked. We show that this “chirality blockade” suppresses the superconducting proximity effect when the magnetization lies in the plane of the NS interface. A Zeeman field at the interface can provide the necessary chirality switch and activate Andreev reflection.
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