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.
Semiconductor Science Technology
- Pub Date:
- June 2009
- Condensed Matter - Mesoscale and Nanoscale Physics
- Submitted as part of a SST special issue on spin-orbit effects in spintronics. Related papers at http://marcuslab.harvard.edu