Effect of confinement on energy-dependent dephasing in heterostructures

S. R. Bolton, S. Bar-Ad, G. Sucha, D. S. Chemla, D. L. Sivco, and A. Y. Cho
Phys. Rev. B 55, 15768 – Published 15 June 1997

Abstract

To study the effects of confinement by quantum-well potential discontinuities on excitonic dephasing, we performed a spectrally and temporally resolved study of band-edge four wave mixing emission from a series of In1xGaxAs quantum wells. Our measurements reveal an array of dynamics as we move from the three-dimensional to the two-dimensional limit. Spectral resolution allows us to resolve a slowly dephasing excitonic contribution in bulk In1xGaxAs. In measurements on quantum-well samples of intermediate width, we find no change of the dephasing time as the quantum-well width becomes smaller than the bulk Bohr diameter. This indicates that the dominant dephasing mechanism in this regime is scattering by alloy disorder and interface roughness. For quantum-well widths below 200 Å we observe a substantial increase of the dephasing time. Spectral resolution allows us to associate the slow dephasing in this regime with localized excitons.

    DOI:https://doi.org/10.1103/PhysRevB.55.15768

    ©1997 American Physical Society

    Authors & Affiliations

    S. R. Bolton, S. Bar-Ad, G. Sucha, and D. S. Chemla

    • Department of Physics, University of California, Berkeley, California 94720
    • and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

    D. L. Sivco and A. Y. Cho

    • Bell Laboratories, Lucent Technologies, 700 Mountain Avenue, Murray Hill, New Jersey 07974

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    Vol. 55, Iss. 23 — 15 June 1997

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