Resonant raman scattering and dispersion of polar optical and acoustic phonons in hexagonal inn
- Russian Academy of Sciences, Ioffe Physicotechnical Institute (Russian Federation)
- Russian Academy of Sciences, Kirensky Institute of Physics (Russian Federation)
- Cornell University, Department of Electrical and Computer Engineering (United States)
- National Tsing-Hua University, Department of Physics (China)
It is shown that a study of the dependence of impurity-related resonant first-order Raman scattering on the frequency of excitation light makes it possible to observe the dispersion of polar optical and acoustic branches of vibrational spectrum in hexagonal InN within a wide range of wave vectors. It is established that the wave vectors of excited phonons are uniquely related to the energy of excitation photon. Frequencies of longitudinal optical phonons E{sub 1}(LO) and A{sub 1}(LO) in hexagonal InN were measured in the range of excitation-photon energies from 2.81 to 1.17 eV and the frequencies of longitudinal acoustic phonons were measured in the range 2.81-1.83 eV of excitation-photon energies. The obtained dependences made it possible to extrapolate the dispersion of phonons A{sub 1}(LO) and E{sub 1}(LO) to as far as the point {Gamma} in the Brillouin zone and estimate the center-band energies of these phonons (these energies have not been uniquely determined so far).
- OSTI ID:
- 21562355
- Journal Information:
- Semiconductors, Vol. 44, Issue 2; Other Information: DOI: 10.1134/S1063782610020065; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-7826
- Country of Publication:
- United States
- Language:
- English
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DISPERSIONS
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IMPURITIES
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ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
INDIUM COMPOUNDS
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