Anisotropic Pauli spin blockade in hole quantum dots

M. Brauns, J. Ridderbos, A. Li, E.P.A.M. Bakkers, W.G. van der Wiel, F. Zwanenburg

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Abstract

We present measurements on gate-defined double quantum dots in Ge-Si core-shell nanowires, which we tune to a regime with visible shell filling in both dots. We observe a Pauli spin blockade and can assign the measured leakage current at low magnetic fields to spin-flip cotunneling, for which we measure a strong anisotropy related to an anisotropic g factor. At higher magnetic fields we see signatures for leakage current caused by spin-orbit coupling between (1,1) singlet and (2,0) triplet states. Taking into account these anisotropic spin-flip mechanisms, we can choose the magnetic field direction with the longest spin lifetime for improved spin-orbit qubits.
Original languageEnglish
Article number041411
Pages (from-to)1-5
JournalPhysical Review B
Volume94
Issue number4
DOIs
Publication statusPublished - 22 Jul 2016

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