Anisotropic Pauli spin blockade in hole quantum dots
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.
- Publication:
-
Physical Review B
- Pub Date:
- July 2016
- DOI:
- 10.1103/PhysRevB.94.041411
- arXiv:
- arXiv:1608.00111
- Bibcode:
- 2016PhRvB..94d1411B
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics;
- Quantum Physics
- E-Print:
- Physical Review B, 94(2016), 041411(R)