Spectroscopy of Spin-Orbit Quantum Bits in Indium Antimonide Nanowires

Stevan Nadj-Perge, Vlad Pribiag, J. W. G. van den Berg, Kun Zuo, Sébastien R. Plissard, Erik P. A. M. Bakkers, Sergey Frolov, Leo P. Kouwenhoven

Abstract

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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