Pulsed Nuclear Pumping and Spin Diffusion in a Single Charged Quantum Dot
| Autor: | Ladd, Thaddeus D., Press, David, De Greve, Kristiaan, McMahon, Peter L., Friess, Benedikt, Schneider, Christian, Kamp, Martin, Hoefling, Sven, Forchel, Alfred, Yamamoto, Yoshihisa |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 105, 107401 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.105.107401 |
| Popis: | We report the observation of a feedback process between the nuclear spins in a single charged quantum dot and its trion transition, driven by a periodic sequence of optical pulses. The pulse sequence intersperses off-resonant ultrafast pulses for coherent electron-spin rotation and resonant narrow-band optical pumping. The feedback manifests as a hysteretic triangle-like pattern in the free-induction-decay of the single spin. We present a simple, quasi-analytic numerical model to describe this observation, indicating that the feedback process results from the countering effects of optical nuclear pumping and nuclear spin-diffusion inside the quantum dot. This effect allows dynamic tuning of the electron Larmor frequency to a value determined by the pulse timing, potentially allowing more complex coherent control operations. Comment: 4 pages, 3 figures |
| Databáze: | arXiv |
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