Anisotropic Pauli spin blockade in hole quantum dots
M. Brauns (University of Twente)
Joost Ridderbos (University of Twente)
Ang Li (Eindhoven University of Technology)
Erik P.A. Bakkers (Eindhoven University of Technology, TU Delft - QN/Bakkers Lab)
Wilfred G. Van Der Wiel (University of Twente)
Floris A. Zwanenburg (University of Twente)
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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.