Finite bulk Josephson currents and chirality blockade removal from interorbital pairing in magnetic Weyl semimetals

Paramita Dutta; Fariborz Parhizgar; Annica M. Black-Schaffer

doi:10.1103/PhysRevB.101.064514

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Finite bulk Josephson currents and chirality blockade removal from interorbital pairing in magnetic Weyl semimetals

Paramita Dutta, Fariborz Parhizgar, Annica M. Black-Schaffer

DOI 10.1103/PhysRevB.101.064514 · Physical Review B

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Abstract

Magnetic Weyl semimetals (WSMs) have been presumed to be immune to proximity-induced spin-singlet superconducting pairing due to a chirality blockade of the regular Andreev reflection. In this work, we study all possible superconducting pairing induced in a WSM sandwiched between two conventional superconductors in a Josephson junction setup. We confirm that, while conventional intraorbital s−wave pairing is present on the surface of the WSM, it cannot propagate into the bulk due to the chirality blockade. However, interorbital s−wave pairing, with both even-frequency spin-singlet and odd-frequency mixed-spin-triplet symmetry, propagates into the bulk of the WSM, as do several p−wave symmetries. To demonstrate the importance of these finite interorbital and p−wave pair amplitudes in an experimental setup, we calculate the Josephson current and find a finite and even increasing current when the chirality blockade effect for the conventional intraorbital pairing is enhanced.