title: Single-shot measurement of triplet-singlet relaxation in a Si/SiGe double quantum dot.
abstract: We investigate the lifetime of two-electron spin states in a few-electron Si/SiGe double dot. At the transition between the (1,1) and (0,2) charge occupations, Pauli spin blockade provides a readout mechanism for the spin state. We use the statistics of repeated single-shot measurements to extract the lifetimes of multiple states simultaneously. When the magnetic field is zero, we find that all three triplet states have equal lifetimes, as expected, and this time is ~10 ms. When the field is nonzero, the T(0) lifetime is unchanged, whereas the T- lifetime increases monotonically with the field, reaching 3 sec at 1 T.
authors.affiliation: University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Prance
authors.forename: Zhan
authors.initials: Z
authors.lastname: Shi
authors.forename: C B
authors.initials: CB
authors.lastname: Simmons
authors.forename: D E
authors.initials: DE
authors.lastname: Savage
authors.forename: M G
authors.initials: MG
authors.lastname: Lagally
authors.forename: L R
authors.initials: LR
authors.lastname: Schreiber
authors.forename: L M K
authors.initials: LM
authors.lastname: Vandersypen
authors.forename: Mark
authors.initials: M
authors.lastname: Friesen
authors.forename: Robert
authors.initials: R
authors.lastname: Joynt
authors.forename: S N
authors.initials: SN
authors.lastname: Coppersmith
authors.forename: M A
authors.initials: MA
authors.lastname: Eriksson