Electrically driven electron spin resonance mediated by spin-valley-orbit coupling in a silicon quantum dot

TL;DR

This paper demonstrates electrically driven electron spin resonance in silicon quantum dots, leveraging spin-valley-orbit coupling enhanced by nanowire geometry, advancing silicon-based quantum spintronics.

Contribution

It reports the first experimental realization of electric spin control in silicon via spin-valley-orbit coupling, supported by modeling and simulations.

Findings

Electrical ESR achieved in silicon quantum dots.

Spin-valley-orbit coupling enables spin control.

Potential for scalable silicon qubits.

Abstract

The ability to manipulate electron spins with voltage-dependent electric fields is key to the operation of quantum spintronics devices, such as spin-based semiconductor qubits. A natural approach to electrical spin control exploits the spin-orbit coupling (SOC) inherently present in all materials. So far, this approach could not be applied to electrons in silicon, due to their extremely weak SOC. Here we report an experimental realization of electrically driven electron-spin resonance in a silicon-on-insulator (SOI) nanowire quantum dot device. The underlying driving mechanism results from an interplay between SOC and the multi-valley structure of the silicon conduction band, which is enhanced in the investigated nanowire geometry. We present a simple model capturing the essential physics and use tight-binding simulations for a more quantitative analysis. We discuss the relevance of our findings to the development of compact and scalable electron-spin qubits in silicon.