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Temperature Dependence of the Intervalley Deformation Potential of GaAs/AlAs Superlattices Under Hydrostatic Pressure

Published online by Cambridge University Press:  10 February 2011

S. Guha ,
Q. Cai ,
M. Chandrasekhar ,
H. R. Chandrasekhar ,
Hyunjung Kim ,
A. D. Alvarenga ,
R. Vogelgesang ,
A. K. Ramdas  and
M. R. Melloch
S. Guha
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, U.S.A.
Q. Cai
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, U.S.A.
M. Chandrasekhar
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, U.S.A.
H. R. Chandrasekhar
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, U.S.A.
Hyunjung Kim
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907, U.S.A.
A. D. Alvarenga
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907, U.S.A.
R. Vogelgesang
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907, U.S.A.
A. K. Ramdas
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907, U.S.A.
M. R. Melloch
Affiliation:
School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, U.S.A
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Abstract

We have studied the pressure dependence of the type-I and type-II transitions in (GaAs)m/(AlAs)m superlattices by photoluminescence (PL) spectroscopy. From the study of PL linewidths of the type-I exciton as a function of pressure and temperature, we determine the intervalley deformation potential. Beyond the type-I and type-II crossover, the PL linewidth increases both as a function of pressure and temperature. We find that the electron-phonon deformation potential for Γ-X intervalley scattering varies with temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 499: Symposium DD – High Pressure Materials Research , 1997 , 201
Copyright
Copyright © Materials Research Society 1998

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References

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