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Nonlinear optical absorption of semiconductor quantum wires: Photoexcitation dynamical effects

Justino R. Madureira, Marcos H. Degani, and Marcelo Z. Maialle
Phys. Rev. B 68, 161301(R) – Published 8 October 2003
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Abstract

We investigate the optical absorption spectra of semiconductor quantum wires and its dependence on the optical pumping power. The absorption coefficient is obtained solving the semiconductor Bloch equations in the real-space and time domains, including corrections due to band-gap renormalization, local field, and screening. We find that the energy shifts in the spectra due to increasing photoexcitation power have different behavior when treating dynamically the carrier creation rather than using stationary carrier distribution at thermal equilibrium. Dealing with the nonequilibrium distribution dynamically, we are able to describe the observed constancy of the peak position of the fundamental transition energy with the optical pumping power. The competing effects of the dynamical band-gap renormalization and the local-field correction leads to an almost cancellation of the red/blue shift energy.

  • Received 4 April 2003

DOI:https://doi.org/10.1103/PhysRevB.68.161301

©2003 American Physical Society

Authors & Affiliations

Justino R. Madureira

  • Instituto de Física, Universidade Estadual de Campinas, CP 6165, 13083-970 Campinas-SP, Brazil

Marcos H. Degani

  • Haras Degani, Ave Fioravante Piovani 1000, 13250-000 Itatiba-SP, Brazil

Marcelo Z. Maialle

  • Liceu Vivere, Rua Duque de Caxias Norte 550, 13635-000 Pirassununga-SP, Brazil

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Issue

Vol. 68, Iss. 16 — 15 October 2003

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