Abstract
The triply degenerate q ≃ 0 optical phonons in diamond type crystals have even-parity and are Raman active and infrared inactive. The application of an electric field modifies the symmetry of the optical phonons and, thereby modifies the polarization selection rules for first order Raman scattering. It is therefore possible to observe an electric field induced Raman scattering by the optical phonons for directions and polarizations of the incident and scattered radiation which normally do not lead to first order Raman scattering. Furthermore, the Raman scattering tensor will exhibit a quadratic dependence on the field. (In the case of crystals lacking a center of inversion, such as zinc-blende type crystals, the Raman scattering tensor will exhibit a linear dependence on the applied field.) We report here the observation of electric field dependent Raman scattering by optical phonons in diamond, together with a discussion of the different types of contributions to the electric field dependent Raman tensor in diamond type crystals. The electric field dependence of the Raman tensor also manifests itself as a high order effect in the electric field induced infrared absorption.
Research supported in part by the U. S. Army Research Office-Durham and the U. S. Office of Naval Research.
On sabbatical leave from the University of Pennsylvania, Philadelphia, Pennsylvania during the 1967–68 Academic year.
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References
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All the coefficients entering the even-power terms of Eq. (1) are non-zero for diamond, but zero for NaCl type crystals. The argument is reversed for the odd-power terms. All these coefficients are nonzero for ZnS type crystals.
J. F. Nye, “Physical Properties of Crystals”, Oxford, 1964.
Because of the residual birefringence, it is resonable to expect a mixing of the configurations -u(w)u or -u(vw)u even when the experimental geometry has been set up for the configuration -u(ww)u. Thus the observed quadratic change can be attributed to the presence of terms of d and f character, and described by an effective coefficient A<Stack><Subscript>ijσ33</Subscript><Superscript>(2)</Superscript></Stack>.
E. Anastassakis and E. Bur stein (to be published).
A.A. Maradudin and E. Burstein, Phys. Rev. 164, 1081 (1968). A (-) sign appears in this reference. However, according to these authors, the sign should be changed to a (+), after a calculational mistake was discovered.
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Anastassakis, E., Filler, A., Bursteint, E. (1969). The Effect of Electric Fields on Raman Scattering in Diamond. In: Wright, G.B. (eds) Light Scattering Spectra of Solids. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-87357-7_45
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DOI: https://doi.org/10.1007/978-3-642-87357-7_45
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