Decoherence processes during optical manipulation of excitonic qubits in semiconductor quantum dots

Q. Q. Wang, A. Muller, P. Bianucci, E. Rossi, Q. K. Xue, T. Takagahara, C. Piermarocchi, A. H. MacDonald, and C. K. Shih
Phys. Rev. B 72, 035306 – Published 6 July 2005

Abstract

Using photoluminescence spectroscopy, we have investigated the nature of Rabi oscillation damping during optical manipulation of excitonic qubits in self-assembled quantum dots. Rabi oscillations were recorded by varying the pulse amplitude for fixed pulse durations between 4ps and 10ps. Up to five periods are visible, making it possible to quantify the excitation dependent damping. We find that this damping is more pronounced for shorter pulse widths and show that its origin is the nonresonant excitation of carriers in the wetting layer, most likely involving bound-to-continuum and continuum-to-bound transitions.

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  • Received 10 February 2005

DOI:https://doi.org/10.1103/PhysRevB.72.035306

©2005 American Physical Society

Authors & Affiliations

Q. Q. Wang1,2,3, A. Muller1, P. Bianucci1, E. Rossi1, Q. K. Xue2, T. Takagahara4, C. Piermarocchi5, A. H. MacDonald1, and C. K. Shih1,*

  • 1Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
  • 2International Center for Quantum Structures (ICQS), Institute of Physics, The Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
  • 3Department of Physics, Wuhan University, Wuhan 430072, People’s Republic of China
  • 4Department of Electronics and Information Science, Kyoto Institute of Technology, Kyoto 606-8585, Japan
  • 5Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA

  • *Author to whom correspondence should be addressed. Electronic address: shih@physics.utexas.edu

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Vol. 72, Iss. 3 — 15 July 2005

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