Acoustic phonon engineering in coated cylindrical nanowires |
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| Affiliation: | 1. Centre for Mathematical Sciences, Arunapuram P.O., Palai, Kerala-686574, India;2. McGill University, 805 Sherbrooke Street West, Montreal, Quebec, H3A2K6, Canada;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Centre for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark;4. Department of Materials Science and Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;5. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, China;1. 2010 Black Engineering Building, Department of Mechanical Engineering, Iowa State University, Ames, IA, 50011, USA;2. School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao, 266033, Shandong Province, PR China;1. Department of Electrical and Computer Engineering, University of California – Riverside, Riverside, CA 92521, USA;2. Kotelnikov Institute of Radio-Engineering and Electronics of the Russian Academy of Sciences, Saratov 410019, Russia;3. Saratov State University, Saratov 410012, Russia;1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;2. Department of Materials Science and Engineering, National University of Singapore 117575, Singapore |
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| Abstract: | We have theoretically investigated the effect of a coating made of the elastically dissimilar material on the acoustic phonon properties of semiconductor nanowires. It is shown that the acoustic impedance mismatch at the interface between the nanowire and the barrier coating affects dramatically the phonon spectra and group velocities in the nanowires. Coatings made of materials with a small sound velocity lead to compression of the phonon energy spectrum and strong reduction of the phonon group velocities. The coatings made of materials with a high sound velocity have opposite effect. Our calculations reveal substantial re-distribution of the elastic deformations in coated nanowires, which results in modification of the phonon transport properties, and corresponding changes in thermal and electrical conduction. We argue that tuning of the coated nanowire material parameters and the barrier layer thickness can be used for engineering the transport properties in such nanostructures. |
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