Anisotropic Pauli spin blockade in hole quantum dots

Matthias Brauns, Joost Ridderbos, Ang Li, Erik P.A.M. Bakkers, Wilfred G. Van Der Wiel, Floris A. Zwanenburg

    Research output: Contribution to journalArticleScientificpeer-review

    18 Citations (Scopus)
    18 Downloads (Pure)

    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
    Number of pages5
    JournalPhysical Review X
    Volume94
    Issue number4
    DOIs
    Publication statusPublished - 2016

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