title: Experimental signature of phonon-mediated spin relaxation in a two-electron quantum dot.
abstract: 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.
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands.
authors.forename: T
authors.initials: T
authors.lastname: Meunier
authors.forename: I T
authors.initials: IT
authors.lastname: Vink
authors.forename: L H Willems
authors.initials: LH
authors.lastname: van Beveren
authors.forename: K-J
authors.initials: KJ
authors.lastname: Tielrooij
authors.forename: R
authors.initials: R
authors.lastname: Hanson
authors.forename: F H L
authors.initials: FH
authors.lastname: Koppens
authors.forename: H P
authors.initials: HP
authors.lastname: Tranitz
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider
authors.forename: L P
authors.initials: LP
authors.lastname: Kouwenhoven
authors.forename: L M K
authors.initials: LM
authors.lastname: Vandersypen