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Spectroscopy of Spin-Orbit Quantum Bits in Indium Antimonide Nanowires

Mon, 2013-02-11 18:41 - Daniel Rudolph
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Date: 
2012-04-19
Author(s): 

S. Nadj-Perge, V. S. Pribiag, J. W. G. van den Berg, K. Zuo, S. R. Plissard, E. P. A. M. Bakkers, S. M. Frolov and L. P. Kouwenhoven

Reference: 

Phys. Rev. Lett. 108, 166801 (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.108.166801

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.