期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.046802
关键词
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资金
- Swiss NSF
- DARPA QuEST
- EPSRC
- The Royal Society
- ANR QUAMOS
- Engineering and Physical Sciences Research Council [EP/G02216X/1, EP/I023186/1] Funding Source: researchfish
- EPSRC [EP/G02216X/1, EP/I023186/1] Funding Source: UKRI
We present a technique for manipulating the nuclear spins and the emission polarization from a single optically active quantum dot. When the quantum dot is tunnel coupled to a Fermi sea, we have discovered a natural cycle in which an electron spin is repeatedly created with resonant optical excitation. The spontaneous emission polarization and the nuclear spin polarization exhibit a bistability. For a sigma(+) pump, the emission switches from sigma(+) to sigma(-) at a particular detuning of the laser. Simultaneously, the nuclear spin polarization switches from positive to negative. Away from the bistability, the nuclear spin polarization can be changed continuously from negative to positive, allowing precise control via the laser wavelength.
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