Optical detection of single-electron spin resonance in a quantum dot.
We demonstrate optically detected spin resonance of a single electron confined to a self-assembled quantum dot. The dot is rendered dark by resonant optical pumping of the spin with a laser. Contrast is restored by applying a radio frequency (rf) magnetic field at the spin resonance. The scheme is sensitive even to rf fields of just a few microT. In one case, the spin resonance behaves as a driven 3-level lambda system with weak damping; in another one, the dot exhibits remarkably strong (67% signal recovery) and narrow (0.34 MHz) spin resonances with fluctuating resonant positions, evidence of unusual dynamic processes.
Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität, München, Germany.
Martin
M
Kroner
Kathrina M
KM
Weiss
Benjamin
B
Biedermann
Stefan
S
Seidl
Stephan
S
Manus
Alexander W
AW
Holleitner
Antonio
A
Badolato
Pierre M
PM
Petroff
Brian D
BD
Gerardot
Richard J
RJ
Warburton
Khaled
K
Karrai