Linear and nonlinear optical properties of realistic quantum-wire structures: The dominant role of Coulomb correlation

Fausto Rossi and Elisa Molinari
Phys. Rev. B 53, 16462 – Published 15 June 1996
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Abstract

A systematic analysis of the linear and nonlinear optical properties of realistic quantum wires is presented. The proposed theoretical approach, based on a set of generalized semiconductor Bloch equations, provides a full three-dimensional multisubband description of carrier-carrier correlation for any profile of the confinement potential, thus allowing a direct comparison with experiments on available structures. In agreement with previous investigations based on simplified one-dimensional models, our analysis shows that, also for realistic quantum-wire structures, electron-hole Coulomb correlation completely removes the one-dimensional band-edge singularities from the linear-absorption spectra. Moreover, we find that this effect is present also at high densities (corresponding to gain regimes) and contributes significantly in suppressing the ideal sharp features of the free-carrier density of states. The multisubband nature of available state-of-the-art structures is found to play a dominant role in determining the overall spectral shape in the whole density range. © 1996 The American Physical Society.

  • Received 15 January 1996

DOI:https://doi.org/10.1103/PhysRevB.53.16462

©1996 American Physical Society

Authors & Affiliations

Fausto Rossi

  • Istituto Nazionale Fisica della Materia (INFM) and Dipartimento di Fisica, Università di Modena, via Campi 213/A, I-41100 Modena, Italy
  • Fachbereich Physik und Zentrum für Materialwissenschaften, Philipps–Universität Marburg, Renthof 5, 35032 Marburg, Germany

Elisa Molinari

  • Istituto Nazionale Fisica della Materia (INFM) and Dipartimento di Fisica, Università di Modena, via Campi 213/A, I-41100 Modena, Italy

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Vol. 53, Iss. 24 — 15 June 1996

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