Lattice dynamics in wide band gap materials based superlattices |
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| Affiliation: | 1. SIMTech-NTU Joint Laboratory (3D Additive Manufacturing), Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;2. Singapore Centre for 3D Printing, School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;3. Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, 637662, Singapore;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan 410082, PR China;2. Department of Engineering Mechanics, Harbin University of Science and Technology, Harbin 150080, PR China;1. Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, D-10117 Berlin, Germany;2. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany;1. Institute of Experimental Physics, University of Wrocław, plac Maksa Borna 9, 50-204 Wrocław, Poland;2. Laboratoire de Dynamique et Structure des Matériaux Moléculaires, U.R.A. C.N.R.S. No. 801, U.F.R. de Physique, Université de Lille I, 59655 Villeneuve d''Ascq Cedex, France |
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| Abstract: | Lattice dynamics calculations in zinc blende group III nitrides superlattices were carried out assuming the existence of interface regions with variable thickness. The acoustic frequencies were observed to remain practically unchanged for all values of interface thickness from one to three monolayers. The dispersion relation, Raman spectrum and the atomic displacements of optical modes were found to be greatly affected by interfacing. Several Raman peaks shift toward the center position of the spectrum with increasing interface thickness. As a consequence, some of the Raman frequencies become quasi-coincident giving rise to highly prominent structures in the middle range spectrum. Effects of localization of atomic displacements at the interface regions are shown. |
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