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Asymmetry in a three-electron double quantum dot (DQD) allows spin blockade,when spin-3/2 (quadruplet) states and spin-1/2 (doublet) states have differentcharge configurations. We have observed this DQD spin blockade near the(1,2)-(2,1) charge transition using a pulsed-gate technique and a chargesensor. We then use this spin blockade to detect Landau-Zener-St\"uckelberg(LZS) interference and coherent oscillations between the spin quadruplet anddoublet states. Such studies add to our understandings of coherence and controlproperties of three-spin states in a double dot, which in turn would benefitthe explorations into various qubit encoding schemes in semiconductornanostructures.

Spin blockade and coherent dynamics of high-spin states in a three-electron double quantum dot