State filling, Coulomb, and trapping effects in the optical nonlinearity of CdTe quantum dots in glass

V. Esch, B. Fluegel, G. Khitrova, H. M. Gibbs, Xu Jiajin, K. Kang, S. W. Koch, L. C. Liu, S. H. Risbud, and N. Peyghambarian
Phys. Rev. B 42, 7450 – Published 15 October 1990
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Abstract

Microcrystallites of CdTe were grown in a special-formula glass, yielding CdTe dots; the linear-absorption spectrum exhibits as many as six quantum-confinement peaks. Excitation of the sample with pulses ranging from femtoseconds to microseconds has allowed us to distinguish between various mechanisms for optical nonlinearity. At very early times, phase-space filling and Coulomb interaction between the excited charged carriers is responsible for the absorption changes, δα. At later times, Coulomb effects due to trapped carriers remain and last for nanoseconds or microseconds.

  • Received 29 June 1990

DOI:https://doi.org/10.1103/PhysRevB.42.7450

©1990 American Physical Society

Authors & Affiliations

V. Esch, B. Fluegel, G. Khitrova, H. M. Gibbs, and Xu Jiajin

  • Optical Sciences Center, University of Arizona, Tucson, Arizona 85721

K. Kang and S. W. Koch

  • Optical Sciences Center, University of Arizona, Tucson, Arizona 85721
  • Department of Physics, University of Arizona, Tucson, Arizona 85721

L. C. Liu and S. H. Risbud

  • Department of Material Science and Engineering, University of Arizona, Tucson, Arizona 85721

N. Peyghambarian

  • Optical Sciences Center, University of Arizona, Tucson, Arizona 85721

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Vol. 42, Iss. 12 — 15 October 1990

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