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Near-bandgap wavelength dependence of long-lived traveling coherent longitudinal acoustic phonons in GaSb-GaAs heterostructures

J. K. Miller, J. Qi, Y. Xu, Y.-J. Cho, X. Liu, J. K. Furdyna, I. Perakis, T. V. Shahbazyan, and N. Tolk
Phys. Rev. B 74, 113313 – Published 27 September 2006
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    Abstract

    We report first studies of long-lived oscillations in optical pump-probe measurements on GaSb-GaAs heterostructures. The oscillations arise from a photogenerated coherent longitudinal acoustic phonon wave, which travels from the top surface of GaSb across the interface into the GaAs substrate, providing information on the optical properties of the material as a function of time/depth. Wavelength-dependent studies of the oscillations near the bandgap of GaAs indicate strong correlations to the optical properties of GaAs.

      • Received 17 August 2006

      DOI:https://doi.org/10.1103/PhysRevB.74.113313

      ©2006 American Physical Society

      Authors & Affiliations

      J. K. Miller1, J. Qi1, Y. Xu1, Y.-J. Cho2, X. Liu2, J. K. Furdyna2, I. Perakis3, T. V. Shahbazyan4, and N. Tolk1

      • 1Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
      • 2Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
      • 3Department of Physics, University of Crete, 71003, Greece
      • 4Department of Physics, Jackson State University, Mississippi 39217, USA

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      Vol. 74, Iss. 11 — 15 September 2006

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      Images

      • Figure 1
        Total pump-probe response of GaSb(20nm)∕GaAs at 890nm at 300K. Inset: the subtracted oscillatory response (open diamond) fitted with a damped oscillation simulation (solid line).Reuse & Permissions
      • Figure 2
        Oscillatory responses at different wavelengths at 30K.Reuse & Permissions
      • Figure 3
        Wavelength dependence of the oscillations parameters fitted with Eq. (3) at 30K. The dash line indicates the bandgap of GaAs. (a) Oscillation period (open triangle) (b) Damping time (star) (c) Amplitude (solid diamond) (d) Initial phase (open circle).Reuse & Permissions
      • Figure 4
        Oscillatory responses at different wavelengths with 500nm GaSb top layer. The dash line indicates when the strain wave travels from GaSb layer into the GaAs substrate.Reuse & Permissions
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