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A Determination of the Symmetry of EL2 Using Ballistic Phonon Transmission

Published online by Cambridge University Press:  26 February 2011

J. C. Culbertson ,
U. Strom  and
S. A. Wolf
J. C. Culbertson
Affiliation:
Naval Research Laboratory, Washington, D. C. 20375
U. Strom
Affiliation:
Naval Research Laboratory, Washington, D. C. 20375
S. A. Wolf
Affiliation:
Naval Research Laboratory, Washington, D. C. 20375
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Abstract

We have measured the time resolved transmission of short pulses of ballistic phonons in a GaAs crystal known to contain the intrinsic defect EL2. These measurements were performed for phonons propagating along several high symmetry directions at 2K. Measurements were made both before and after the crystal was irradiated with 1.06 μm light to convert EL2 from its ground state to its metastable state. The changes in phonon transmission measured for the different phonon polarizations and propagation directions lead us to associate a trigonal symmetry with the defect whose phonon scattering has changed. The identification of this defect as EL2 is discussed below.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 104 , 1987 , 393
Copyright
Copyright © Materials Research Society 1988

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References

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