Measurements of spin-orbit interaction in epitaxially grown InAs nanosheets

TL;DR

This study investigates the spin-orbit interaction in epitaxially grown InAs nanosheets, revealing strong spin-orbit coupling and promising applications in spintronics and quantum devices through low-temperature transport measurements.

Contribution

It provides the first detailed measurement of spin-orbit length in epitaxial InAs nanosheets, demonstrating their potential for quantum technology applications.

Findings

Spin-orbit length is approximately 150 nm.

The nanosheet exhibits excellent electrical properties.

Strong spin-orbit interaction is confirmed.

Abstract

We report on a low-temperature transport study of a single-gate, planar field-effect device made from a free-standing, wurtzite-crystalline InAs nanosheet. The nanosheet is grown via molecular beam epitaxy and the field-effect device is characterized by gate transfer characteristic measurements and by magnetic field orientation dependent transport measurements. The measurements show that the device exhibits excellent electrical properties and the electron transport in the nanosheet is of the two-dimensional nature. Low-field magnetoconductance measurements are performed for the device at different gate voltages and temperatures, and the characteristic transport lengths, such as phase coherent length, spin-orbit length and mean free path, in the nanosheet are extracted. It is found that the spin-orbit length in the nanosheet is short, on the order of 150 nm, demonstrating the presence of strong spin-orbit interaction in the InAs nanosheet. Our results show that epitaxially grown, free-standing, InAs nanosheets can serve as an emerging semiconductor nanostructure platform for applications in spintronics, spin qubits and planar topological quantum devices.