Experimental signature of phonon-mediated spin relaxation in a two-electron quantum dot.
We observe an experimental signature of the role of phonons in spin relaxation between triplet and singlet states in a two-electron quantum dot. Using both the external magnetic field and the electrostatic confinement potential, we change the singlet-triplet energy splitting from 1.3 meV to zero and observe that the spin relaxation time depends nonmonotonously on the energy splitting. A simple theoretical model is derived to capture the underlying physical mechanism. The present experiment confirms that spin-flip energy is dissipated in the phonon bath.
Meunier
T
T
Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands.
Vink
I T
IT
van Beveren
L H Willems
LH
Tielrooij
K-J
KJ
Hanson
R
R
Koppens
F H L
FH
Tranitz
H P
HP
Wegscheider
W
W
Kouwenhoven
L P
LP
Vandersypen
L M K
LM