Journal
PHYSICAL REVIEW B
Volume 87, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.161305
Keywords
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Funding
- SNF
- NCCR Nano
- NCCR QSIT
- DARPA
- IARPA
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We theoretically consider g factor and spin lifetimes of holes in a longitudinal Ge/Si core/shell nanowire quantum dot that is exposed to external magnetic and electric fields. For the ground states, we find a large anisotropy of the g factor which is highly tunable by applying electric fields. This tunability depends strongly on the direction of the electric field with respect to the magnetic field. We calculate the single-phonon hole spin relaxation times T-1 for zero and small electric fields and propose an optimal setup in which very large T-1 of the order of tens of milliseconds can be reached. Increasing the relative shell thickness or the longitudinal confinement length further prolongs T-1. In the absence of electric fields, the dephasing vanishes and the decoherence time T-2 is determined by T-2 = 2T(1). DOI: 10.1103/PhysRevB.87.161305
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