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

Authors:
  • SNS. Nadj-Perge
    S. Nadj-Perge
  • SFS. M. Frolov
    S. M. Frolov
  • JTJ. W. W. van Tilburg
    J. W. W. van Tilburg
  • JDJ. Danon
    J. Danon
  • YNYu. V. Nazarov
    Yu. V. Nazarov
  • RAR. Algra
    R. Algra
  • EBE. P. A. M. Bakkers
    E. P. A. M. Bakkers
  • LKL. P. Kouwenhoven
    L. P. Kouwenhoven
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Abstract
We have achieved the few-electron regime in InAs nanowire double quantum dots. Spin blockade is observed for the first two half-filled orbitals, where the transport cycle is interrupted by forbidden transitions between triplet and singlet states. Partial lifting of spin blockade is explained by spin-orbit and hyperfine mechanisms that enable triplet to singlet transitions. The measurements over a wide range of interdot coupling and tunneling rates to the leads are well reproduced by a simple transport model. This allows us to separate and quantify the contributions of the spin-orbit and hyperfine interactions.