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Phys. Rev. B 72, 153311 (2005) [4 pages]

Propagating coherent acoustic phonon wave packets in InxMn1−xAs∕GaSb

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J. Wang, Y. Hashimoto*, and J. Kono†
Department of Electrical and Computer Engineering, Rice Quantum Institute, and Center for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA

A. Oiwa‡
PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi 332-0012, Japan

H. Munekata
Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan

G. D. Sanders and C. J. Stanton
Department of Physics, University of Florida, Gainesville, Florida 32611, USA

Received 10 May 2005; revised 1 August 2005; published 25 October 2005

We observe pronounced oscillations in the differential reflectivity of a ferromagnetic InMnAs∕GaSb heterostructure using two-color pump-probe spectroscopy. Although originally thought to be associated with the ferromagnetism, our studies show that the oscillations instead result from changes in the position and frequency-dependent dielectric function due to the generation of coherent acoustic phonons in the ferromagnetic InMnAs layer and their subsequent propagation into the GaSb. Our theory accurately predicts the experimentally measured oscillation period and decay time as a function of probe wavelength.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.153311
DOI:
10.1103/PhysRevB.72.153311
PACS:
75.50.Pp, 85.75.−d

*Present address: Graduate School of Science and Technology, Chiba University, Chiba, Japan.

†Corresponding author. Electronic address: kono@rice.edu

‡Present address: Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

 
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