Magnetotransport properties of individual InAs nanowires

TL;DR

This study investigates the magnetotransport behavior of individual InAs nanowires, revealing tunable quantum interference effects and the influence of surface scattering on high-field mobility, advancing understanding of nanoscale electronic properties.

Contribution

It demonstrates how gate voltage controls phase coherence and spin-orbit lengths, and highlights the importance of surface scattering in high-field magnetotransport in nanowires.

Findings

Gate voltage tunes phase coherence and spin-orbit lengths.

Weak localization transitions to weak anti-localization with increased gate voltage.

Magnetoresistance and mobility are significantly affected by magnetic field.

Abstract

We probe the magnetotransport properties of individual InAs nanowires in a field effect transistor geometry. In the low magnetic field regime we observe magnetoresistance that is well described by the weak localization (WL) description in diffusive conductors. The weak localization correction is modified to weak anti-localization (WAL) as the gate voltage is increased. We show that the gate voltage can be used to tune the phase coherence length ($l_\phi$) and spin-orbit length ($l_{so}$) by a factor of $\sim$ 2. In the high field and low temperature regime we observe the mobility of devices can be modified significantly as a function of magnetic field. We argue that the role of skipping orbits and the nature of surface scattering is essential in understanding high field magnetotransport in nanowires.