Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-10-04
Physics Letters A 350 (2006) 302-308
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 6 figures, elsart.cls is used
Scientific paper
10.1016/j.physleta.2005.10.047
In this work, using the scattering matrix method, we have investigated the transmission coefficients and the thermal conductivity in a double-bend waveguide structure. The transmission coefficients show strong resonances due to the scattering in the midsection of a double-bend structure; the positions and the widths of the resonance peaks are determined by the dimensions of the midsection of the structure. And the scattering in the double-bend structure makes the thermal conductivity decreases with the increasing of the temperature first, then increases after reaches a minimum. Furthermore, the investigations of the multiple double-bend structures indicate that the first additional double-bend structure suppresses the transmission coefficient and the frequency gap formed; and the additional double-bend structures determine the numbers of the resonance peaks at the frequency just above the gap region. These results could be useful for the design of phonon devices.
Ding Zejun
Ming Yi
Wang Zhexian
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