Anisotropic Pauli spin blockade in hole quantum dots

Article

关键词: GE/SI HETEROSTRUCTURE NANOWIRE;    ISOTOPE-SEPARATION;    SINGLE-CRYSTALS;    TRANSPORT;    GROWTH;   

DOI  :  10.1103/PhysRevB.94.041411

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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