Multi-mode Fabry-P\'erot conductance oscillations in suspended stacking-faults-free InAs nanowires

TL;DR

This paper demonstrates coherent, nearly ballistic electron transport in suspended high-quality InAs nanowires, evidenced by Fabry-Pérot conductance oscillations, highlighting the potential for quantum transport applications.

Contribution

It reports the fabrication and observation of multi-mode Fabry-Pérot conductance oscillations in suspended InAs nanowires with minimized defects and substrate effects.

Findings

Observation of coherent electron transport in InAs nanowires

Fabry-Pérot conductance oscillations indicate nearly ballistic transport

Oscillation period matches the physical device length

Abstract

We report on observation of coherent electron transport in suspended high-quality InAs nanowire-based devices. The InAs nanowires were grown by low-temperature gold-assisted vapor-liquid-solid molecular-beam-epitaxy. The high quality of the nanowires was achieved by removing the typically found stacking-faults and reducing possible Au incorporation. Minimizing substrate-induced scattering in the device was achieved by suspending the nanowires over predefined grooves. Coherent transport involving more than a single one-dimensional mode transport, was observed in the experiment, manifested by Fabry-P\'erot conductance oscillations. The length of the Fabry-P\'erot interferometer, deduced from the period of the conductance oscillations, was found to be close to the physical length of the device. The high oscillations visibility imply nearly ballistic electron transport through the nanowire.