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Phys. Rev. B 72, 035306 (2005) [5 pages]

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

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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

Received 10 February 2005; published 6 July 2005

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 4 ps and 10 ps. 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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.035306
DOI:
10.1103/PhysRevB.72.035306
PACS:
78.67.Hc, 42.50.Hz, 78.47.+p, 78.55.Cr

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

 
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