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We have achieved the few-electron regime in InAs nanowire double quantumdots. Spin blockade is observed for the first two half-filled orbitals, wherethe transport cycle is interrupted by forbidden transitions between triplet andsinglet states. Partial lifting of spin blockade is explained by spin-orbit andhyperfine mechanisms that enable triplet to singlet transitions. Themeasurements over a wide range of interdot coupling and tunneling rates to theleads are well reproduced by a simple transport model. This allows us toseparate and quantify the contributions of the spin-orbit and hyperfineinteractions.

Disentangling the effects of spin-orbit and hyperfine interactions on spin blockade