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  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1998),
  • paper QFB3

Biexponential decoherence in photon echoes: spectral evidence for nearly degenerate localized excitons

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Abstract

Much recent progress has been made in the understanding of the optical response of low-dimensional semiconductors. However, additional complications of strong localization and their effects on dynamics and the coherent optical response remain unresolved. Using a highly disordered GaAs single quantum well (width 42 A), we report the nonlinear signal in a self-diffracted transient four-wave mixing (FWM) experiment extending over more than three decades in amplitude as a function of pulse delay [inset of Fig. 1(a)], With that dynamic range, it becomes dear that the decay of the nonlinear signal is biexponential, i.e., with two different values of the decoherence time T2.

© 1998 Optical Society of America

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