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

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.

Submitted as part of a SST special issue on spin-orbit effects in spintronics. Related papers at http://marcuslab.harvard.edu

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• Single-electron shell occupation and effective $g$-factor in few-electron nanowire quantum dots
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• Electrically driven spin resonance with bichromatic driving