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arXiv · 1608.00111

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
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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.

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Matthias Brauns, Joost Ridderbos, Ang Li, Erik P. A. M. Bakkers, Wilfred G. van der Wiel, Floris A. Zwanenburg. 2016-07-30. Anisotropic Pauli spin blockade in hole quantum dots. https://doi.org/10.1103/physrevb.94.041411

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