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.
Kroner
Martin
M
Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität, München, Germany.
Weiss
Kathrina M
KM
Biedermann
Benjamin
B
Seidl
Stefan
S
Manus
Stephan
S
Holleitner
Alexander W
AW
Badolato
Antonio
A
Petroff
Pierre M
PM
Gerardot
Brian D
BD
Warburton
Richard J
RJ
Karrai
Khaled
K