Spin-resolved nonlocal transport in proximitized Rashba nanowires
arxiv(2024)
摘要
Non-equilibrium transport in hybrid semiconductor-superconductor nanowires is
crucial for many quantum phenomena such as generating entangled states via
cross Andreev reflection (CAR) processes, detecting topological
superconductivity, reading out Andreev spin qubits, coupling spin qubits over
long distances and so on. Here, we investigate numerically transport properties
of a proximitized Rashba nanowire that hosts spin-polarized low-energy
quasiparticle states. We show that the spin polarization in such
one-dimensional Andreev bands, extended over the entire nanowire length, can be
detected in nonlocal transport measurements with tunnel-coupled side leads that
are spin polarized. Remarkably, we find an exact correspondence between the
sign of the nonlocal conductance and the spin density of the superconducting
quasiparticles at the side lead position. We demonstrate that this feature is
robust to moderate static disorder. As an example, we show that such a method
can be used to detect spin inversion of the bands, accompanying the topological
phase transition (TPT) for realistic system parameters. Furthermore, we show
that such effects can be used to switch between CAR and elastic cotunneling
(ECT) processes by tuning the strength of either the electric or the magnetic
field. These findings hold significant practical implications for
state-of-the-art transport experiments in such hybrid systems.
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