期刊
PHYSICAL REVIEW B
卷 81, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.035332
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资金
- EPSRC [EP/G000883/1]
- QIP IRC
- University of Cambridge
- Engineering and Physical Sciences Research Council [EP/G000883/1] Funding Source: researchfish
We temporally resolve the resonance fluorescence from an electron spin confined to a single self-assembled quantum dot to measure directly the spin's optical initialization and natural relaxation time scales at 4 K. Our measurements demonstrate that spin initialization occurs on the order of microseconds in the Faraday configuration when a laser resonantly drives the quantum dot transition. We show that the mechanism mediating the optically induced spin-flip changes from electron-nuclei interaction to hole-mixing interaction at 0.6 T external magnetic field. Spin relaxation measurements result in times on the order of milliseconds and suggest that a B-5 magnetic field dependence, due to spin-orbit coupling, is sustained all the way down to 2.2 T.
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