Dynamic Nuclear Spin Polarization in the Resonant Laser Excitation of an InGaAs Quantum Dot

Year: 2012

Authors: Hogele A., Kroner M., Latta C., Claassen M., Carusotto I., Bulutay C., Imamoglu A.

Autors Affiliation: Fakultät für Physik and CeNS, Ludwig-Maximilians-Universität München, D-80539 München, Germany Institute of Quantum Electronics, ETH Zurich, CH-8093, Zürich, Switzerland Physics Department, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA Department of Applied Physics, Stanford University, Stanford, California 94305, US INO-CNR BEC Center and Dipartimento di Fisica, Universitdi Trento, I-38123 Povo, Ital Department of Physics, Bilkent University, Ankara, 06800, Turkey

Abstract: Resonant optical excitation of lowest-energy excitonic transitions in self-assembled quantum dots leads to nuclear spin polarization that is qualitatively different from the well-known optical orientation phenomena. By carrying out a comprehensive set of experiments, we demonstrate that nuclear spin polarization manifests itself in quantum dots subjected to finite external magnetic field as locking of the higher energy Zeeman transition to the driving laser field, as well as the avoidance of the resonance condition for the lower energy Zeeman branch. We interpret our findings on the basis of dynamic nuclear spin polarization originating from noncollinear hyperfine interaction and find excellent agreement between experiment and theory. Our results provide evidence for the significance of noncollinear hyperfine processes not only for nuclear spin diffusion and decay, but also for buildup dynamics of nuclear spin polarization in a coupled electron-nuclear spin system.


Volume: 108 (19)      Pages from: 197403  to: 197403

More Information: We acknowledge financial support from NCCR-Nanoscience, ERC, and the DFG (SFB 631). We thank J. M. Sanchez, A. Badolato, D. Schuh, and W. Wegscheider for growing the two samples used in this work. We also acknowledge useful discussions with M. Atature, N. Vamivakas, Y. Zhang, M. Issler, and P. Maletinsky.
DOI: 10.1103/PhysRevLett.108.197403

Citations: 61
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