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

A. Högele, M. Kroner, C. Latta, M. Claassen, I. Carusotto, C. Bulutay, and A. Imamoglu
Phys. Rev. Lett. 108, 197403 – Published 9 May 2012
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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.

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  • Received 25 October 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.197403

© 2012 American Physical Society

Authors & Affiliations

A. Högele1, M. Kroner2, C. Latta2,3, M. Claassen4, I. Carusotto5, C. Bulutay2,6, and A. Imamoglu2

  • 1Fakultät für Physik and CeNS, Ludwig-Maximilians-Universität München, D-80539 München, Germany
  • 2Institute of Quantum Electronics, ETH Zürich, CH-8093, Zürich, Switzerland
  • 3Physics Department, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA
  • 4Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 5INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, I-38123 Povo, Italy
  • 6Department of Physics, Bilkent University, Ankara, 06800, Turkey

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Issue

Vol. 108, Iss. 19 — 11 May 2012

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