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Spectroscopy of spin-orbit quantum bits in indium antimonide nanowires. 2012
S Nadj-Perge, and
V S Pribiag, and
J W G van den Berg, and
K Zuo, and
S R Plissard, and
E P A M Bakkers, and
S M Frolov, and
L P Kouwenhoven
Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
A double quantum dot in the few-electron regime is achieved using local gating in an InSb nanowire. The spectrum of two-electron eigenstates is investigated using electric dipole spin resonance. Singlet-triplet level repulsion caused by spin-orbit interaction is observed. The size and the anisotropy of singlet-triplet repulsion are used to determine the magnitude and the orientation of the spin-orbit effective field in an InSb nanowire double dot. The obtained results are confirmed using spin blockade leakage current anisotropy and transport spectroscopy of individual quantum dots.
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