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Quantum Interference Effects in InAs Semiconductor Nanowires

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arxiv 0712.4298 v1 pith:5P22LMCF submitted 2007-12-28 cond-mat.mes-hall cond-mat.supr-con

Quantum Interference Effects in InAs Semiconductor Nanowires

classification cond-mat.mes-hall cond-mat.supr-con
keywords conductancetemperatureeffectsfluctuationsinasinterferencenanowiresquantum
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report quantum interference effects in InAs semiconductor nanowires strongly coupled to superconducting electrodes. In the normal state, universal conductance fluctuations are investigated as a function of magnetic field, temperature, bias and gate voltage. The results are found to be in good agreement with theoretical predictions for weakly disordered one-dimensional conductors. In the superconducting state, the fluctuation amplitude is enhanced by a factor up to ~ 1.6, which is attributed to a doubling of charge transport via Andreev reflection. At a temperature of 4.2 K, well above the Thouless temperature, conductance fluctuations are almost entirely suppressed, and the nanowire conductance exhibits anomalous quantization in steps of e^{2}/h.

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