Spectroscopy of spin-orbit quantum bits in indium antimonide nanowires.
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.
Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
S
S
Nadj-Perge
V S
VS
Pribiag
J W G
JW
van den Berg
K
K
Zuo
S R
SR
Plissard
E P A M
EP
Bakkers
S M
SM
Frolov
L P
LP
Kouwenhoven