Strong spin-orbit interaction and g-factor renormalization of hole spins in Ge/Si nanowire quantum dots

F.N.M. Froning, M. J. Rančić, B. Hetényi, S. Bosco, M.K. Rehmann, Ang Li, Erik P.A.M. Bakkers, Floris Arnoud Zwanenburg, Daniel Loss, D.M. Zumbuhl, F.R. Braakman

Research output: Working paper

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Abstract

The spin-orbit interaction lies at the heart of quantum computation with spin qubits, research on topologically non-trivial states, and various applications in spintronics. Hole spins in Ge/Si core/shell nanowires experience a spin-orbit interaction that has been predicted to be both strong and electrically tunable, making them a particularly promising platform for research in these fields. We experimentally determine the strength of spin-orbit interaction of hole spins confined to a double quantum dot in a Ge/Si nanowire by measuring spin-mixing transitions inside a regime of spin-blockaded transport. We find a remarkably short spin-orbit length of ∼65 nm, comparable to the quantum dot length and the interdot distance. We additionally observe a large orbital effect of the applied magnetic field on the hole states, resulting in a large magnetic field dependence of the spin-mixing transition energies. Strikingly, together with these orbital effects, the strong spin-orbit interaction causes a significant enhancement of the g-factor with magnetic field.The large spin-orbit interaction strength demonstrated is consistent with the predicted direct Rashba spin-orbit interaction in this material system and is expected to enable ultrafast Rabi oscillations of spin qubits and efficient qubit-qubit interactions, as well as provide a platform suitable for studying Majorana zero modes.
Original languageEnglish
PublisherArXiv
Number of pages15
Publication statusPublished - 8 Jul 2020

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