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Quantized Andreev conductance in semiconductor nanowires
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abstract
Clean one-dimensional electron systems can exhibit quantized conductance. The plateau conductance doubles if the transport is dominated by Andreev reflection. Here, we report quantized conductance observed in both Andreev and normal-state transports in PbTe-Pb and PbTe-In hybrid nanowires. The Andreev plateau is observed at $4e^2/h$, twice of the normal plateau value of $2e^2/h$. In comparison, Andreev conductance in the best-optimized III-V nanowires is non-quantized due to mode-mixing induced dips (a disorder effect), despite the quantization of normal-state transport. The negligible mode mixing in PbTe hybrids indicates an unprecedented low-disorder transport regime for nanowire devices, beneficial for Majorana researches.
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Anisotropy of PbTe nanowires with and without a superconductor
Bare PbTe nanowires show reproducible 45-degree g-factor anisotropy, and adding a Pb superconductor rotates and gate-tunes the magnetic-field anisotropy direction.
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