Coherent exciton-photon dynamics in semiconductor microcavities:The influence of inhomogeneous broadening

G. Bongiovanni, A. Mura, F. Quochi, S. Gürtler, J. L. Staehli, F. Tassone, R. P. Stanley, U. Oesterle, and R. Houdré
Phys. Rev. B 55, 7084 – Published 15 March 1997
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Abstract

We investigate a GaAs/(Ga,Al)As Fabry-Pérot microcavity, into which (In,Ga)As quantum wells have been inserted. The cavity is wedge shaped, i.e., the detuning between the bare-exciton resonance and the bare optical cavity mode depends on the spatial position on the sample. Linear transmission spectra reveal a well-resolved Rabi splitting of 8 meV at resonance, an inhomogeneously broadened exciton transition of 4–5-meV width, and an 0.7-meV-wide Fabry-Pérot mode. The time-resolved transmission exhibits deep beatings and a subpicosecond exponential decay: a behavior similar to that foreseen in the strong-coupling regime and in the absence of electronic disorder. Conversely, the four-wave mixing response appears weakly influenced by the cavity and not much different from what is expected for bare excitons. A photon echo, dephasing times as long as 50 ps, and only weak Rabi oscillations are observed. The experimentally observed features can be explained by a model based on the numerical solutions of the Maxwell-Bloch equations. This model confirms the dramatic influence structural disorder in the quantum wells has on the coherent nonlinear exciton-photon dynamics.

  • Received 16 July 1996

DOI:https://doi.org/10.1103/PhysRevB.55.7084

©1997 American Physical Society

Authors & Affiliations

G. Bongiovanni and A. Mura

  • Istituto Nazionale di Fisica della Materia (INFM) and Dipartimento di Scienze Fisiche, Universit`a degli Studi di Cagliari,

F. Quochi, S. Gürtler, and J. L. Staehli

  • Institut de Physique Appliquée, Ecole Polytechnique Fédérale, PH-Ecublens, CH-1015 Lausanne, Switzerland

F. Tassone

  • Institut de Physique Théorique, Ecole Polytechnique Fédérale, PH-Ecublens, CH-1015 Lausanne, Switzerland

R. P. Stanley, U. Oesterle, and R. Houdré

  • Institut de Micro- et Optoélectronique, Ecole Polytechnique Fédérale, PH-Ecublens, CH-1015 Lausanne, Switzerland

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Issue

Vol. 55, Iss. 11 — 15 March 1997

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