Excitation of a Si/SiGe quantum dot using an on-chip microwave antenna

TL;DR

This paper demonstrates microwave excitation of a Si/SiGe quantum dot using an on-chip antenna, revealing photon-assisted tunneling effects and exploring magnetic field gradient generation with considerations of heating effects.

Contribution

It introduces on-chip microwave excitation for Si/SiGe quantum dots and investigates local magnetic field gradient generation and associated heating limitations.

Findings

Photon-assisted tunneling signatures observed

Small impact on charge stability

Bounds on magnetic field gradients established

Abstract

We report transport measurements on a Si/SiGe quantum dot subject to microwave excitation via an on-chip antenna. The response shows signatures of photon-assisted tunneling and only a small effect on charge stability. We also explore the use of a d.c. current applied to the antenna for generating tunable, local magnetic field gradients and put bounds on the achievable field gradients, limited by heating of the reservoirs.