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arXiv · 1703.02320

Magnetic-field orientation dependence of transport properties of topologically superconducting wire

V. V. Val'kov·S. V. Aksenov
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Abstract

We present the study of transport properties of a superconducting wire with strong Rashba spin-orbit coupling for different orientations of an external magnetic field. Using the nonequilibrium Green's functions in the tight-binding approach the crucial impact of the relative alignment of lead magnetization and the Majorana bound state (MBS) spin polarization on the low-bias conductance and shot noise is presented. Depending on this factor the transport regime can effectively vary from symmetric to extremely asymmetric. In the last situation the current-symmetry breaking, the suppression of the MBS-assisted conductance and specific Fano factor behavior lead to current-switch effect. The persistence of these features under the presence of diagonal disorder and phenomenologically modeled g-factor anisotropy is demonstrated. In the case of paramagnetic leads the MBS spin polarization gives rise to the spin-filtering effect depending on the magnetic-field orientation.

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V. V. Val'kov, S. V. Aksenov. 2017-03-07. Magnetic-field orientation dependence of transport properties of topologically superconducting wire. https://arxiv.org/abs/1703.02320

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