Microwave band on-chip coil technique for single electron spin resonance in a quantum dot

TL;DR

This paper presents the development and testing of microwave on-chip microcoils for single electron spin resonance in quantum dots, including design optimization, electromagnetic analysis, and a compensation technique to improve signal clarity.

Contribution

It introduces a novel on-chip coil design and a microwave electric field compensation method to enhance single electron spin resonance measurements in quantum dots.

Findings

Optimized coil designs with favorable impedance and field distribution.

Effective suppression of photon assisted tunneling signals.

Successful operation at dilution temperatures for quantum dot experiments.

Abstract

Microwave band on-chip microcoils are developed for the application to single electron spin resonance measurement with a single quantum dot. Basic properties such as characteristic impedance and electromagnetic field distribution are examined for various coil designs by means of experiment and simulation. The combined setup operates relevantly in the experiment at dilution temperature. The frequency responses of the return loss and Coulomb blockade current are examined. Capacitive coupling between a coil and a quantum dot causes photon assisted tunneling, whose signal can greatly overlap the electron spin resonance signal. To suppress the photon assisted tunneling effect, a technique for compensating for the microwave electric field is developed. Good performance of this technique is confirmed from measurement of Coulomb blockade oscillations.