Chirality blockade of Andreev reflection in a magnetic Weyl semimetal
Bovenzi, N. and Breitkreiz, M. and Baireuther, P. and O'Brien, T. E. and Tworzydło, J. and Adagideli, İnanç and Beenakker, C. W. J. (2017) Chirality blockade of Andreev reflection in a magnetic Weyl semimetal. Physical Review B: Condensed Matter and Materials Physics, 96 (3). ISSN 2469-9950 (Print) 2469-9969 (Online)
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Official URL: http://dx.doi.org/10.1103/PhysRevB.96.035437
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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