期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.066804
关键词
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资金
- EPSRC [EP/G601642/1, EP/C54563X/1]
- EPSRC IRC
- Royal Society
- Engineering and Physical Sciences Research Council [EP/C54563X/1] Funding Source: researchfish
We demonstrate that efficient optical pumping of nuclear spins in semiconductor quantum dots (QDs) can be achieved by resonant pumping of optically forbidden transitions. This process corresponds to one-to-one conversion of a photon absorbed by the dot into a polarized nuclear spin, and also has potential for initialization of hole spin in QDs. We find that by employing this spin-forbidden process, nuclear polarization of 65% can be achieved, markedly higher than from pumping the allowed transition, which saturates due to the low probability of electron-nuclear spin flip-flop.
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