A new mechanism of electric dipole spin resonance: hyperfine coupling in quantum dots

TL;DR

This paper investigates a novel hyperfine-mediated electric dipole spin resonance mechanism in quantum dots, demonstrating its experimental and theoretical aspects, including nuclear polarization effects and device-specific magnetic field control.

Contribution

It introduces and analyzes a new hyperfine coupling mechanism for electric dipole spin resonance in quantum dots, with experimental validation and device implementation insights.

Findings

Resonant frequency depends on hyperfine effective field

Nuclear polarization is generated by resonance driving

Device with micromagnet enables selective addressing of electrons

Abstract

A recently discovered mechanism of electric dipole spin resonance, mediated by the hyperfine interaction, is investigated experimentally and theoretically. The effect is studied using a spin-selective transition in a GaAs double quantum dot. The resonant frequency is sensitive to the instantaneous hyperfine effective field, revealing a nuclear polarization created by driving the resonance. A device incorporating a micromagnet exhibits a magnetic field difference between dots, allowing electrons in either dot to be addressed selectively. An unexplained additional signal at half the resonant frequency is presented.