Latta, C. and Hoegele, A. and Zhao, Y. and Vamivakas, A. N. and Maletinsky, P. and Kroner, M. and Dreiser, J. and Carusotto, I. and Badolato, A. and Schuh, D. and Wegscheider, W. and Atature, M. and Imamoglu, A. (2009) Confluence of resonant laser excitation and bidirectional quantum-dot nuclear-spin polarization. NATURE PHYSICS, 5 (10). pp. 758-763. ISSN 1745-2473,
Full text not available from this repository. (Request a copy)Abstract
Resonant laser scattering along with photon correlation measurements established the atom-like character of quantum dots. Here, we show that for a wide range of experimental parameters it is impossible to isolate elementary quantum-dot excitations from a strong influence of nuclear spins; the absorption lineshapes at magnetic fields exceeding 1 T indicate that the nuclear spins get polarized by an amount that ensures locking of the quantum-dot resonance to the incident laser frequency. In stark contrast to earlier experiments, this nuclear-spin polarization is bidirectional, allowing the combined electron-nuclear-spin system to track the changes in laser frequency dynamically on both sides of the resonance. This unexpected feature stems from a competition between two spin-pumping processes that attempt to polarize nuclear spins in opposite directions. We find that the confluence of laser excitation and nuclear-spin polarization suppresses the fluctuations in resonant absorption. A master-equation analysis suggests narrowing of the nuclear-spin distribution, pointing to applications in quantum information processing.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | STATE PREPARATION; ELECTRON-SPIN; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Werner Wegscheider |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Sep 2020 07:12 |
| Last Modified: | 04 Sep 2020 07:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/28363 |
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