Hyperfine-mediated gate-driven electron spin resonance.
An all-electrical spin resonance effect in a GaAs few-electron double quantum dot is investigated experimentally and theoretically. The magnetic field dependence and absence of associated Rabi oscillations are consistent with a novel hyperfine mechanism. The resonant frequency is sensitive to the instantaneous hyperfine effective field, and the effect can be used to detect and create sizable nuclear polarizations. A device incorporating a micromagnet exhibits a magnetic field difference between dots, allowing electrons in either dot to be addressed selectively.
Laird
E A
EA
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Barthel
C
C
Rashba
E I
EI
Marcus
C M
CM
Hanson
M P
MP
Gossard
A C
AC