We identify an effect of chirality in the electrical conduction along magnetic vortices in a Weyl superconductor. The conductance depends on whether the magnetic field is parallel or antiparallel to the vector in the Brillouin zone that separates Weyl points of opposite chirality.
DOI:https://doi.org/10.1103/PhysRevB.104.125444
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Left panel: Weyl superconductor formed by alternating layers of magnetic topological insulator (TI, magnetization ) and s-wave superconductor (S, pair potential , chemical potential ), between normal-metal contacts ( and ). A magnetic field perpendicular to the layers (along ) produces a Landau band that is dispersionless in the – plane, with free propagation in the direction. Right panel: Weyl points of opposite chirality at . For the conductance depends on whether the magnetic field points parallel or antiparallel to the vector from to .
Reuse & PermissionsComparison of the transferred charge across the NS interface and the charge expectation value of the Weyl fermions. The curves are computed from Eqs. (4.14) and (4.17a) using from the full nonlinear dispersion (4.13).
Reuse & PermissionsDependence of the conductance on the pair potential , computed from the tight-binding model for parallel to (left panel) and for perpendicular to (right panel). The parameters are , , and (so there is no difference between parallel or antiparallel orientation of ). The red and blue curves show the results with and without a large potential step at the NS interfaces. The black curve is the result from Ref. [13].
Reuse & PermissionsDependence of the conductance on the orientation of , when it is perpendicular to and there is a large potential step at the NS interfaces (limit ). The colored curves show as a function of , computed from the tight-binding model (, three values of , two values of ). The black-dotted line is the linear dependence following from Eq. (5.7).
Reuse & Permissions
