Volume 83, Number 6, September 2008
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||08 September 2008|
Tunable phonon resonances and thermal conductance in weakly nonlinear disordered systems with short-range correlation
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, China
Corresponding author: firstname.lastname@example.org
Accepted: 30 July 2008
We theoretically investigate the resonant transmission of phonons and step-like thermal conductance in a weakly nonlinear generalized random n-mer (NGRN) system, where the impurity cluster with short-range correlation is randomly distributed in the host monatomic chain, and the atoms are connected by anharmonic potentials. The weakly anharmonic potential can be reduced to the quasi-harmonic form, which is tuned by external stretching. Due to the delocalization of phonons, resonant transmission is observed and thermal conductance presents a “quantized” feature. By applying external stretching on the NGRN system, the number of resonant modes and their locations are tuned. As a consequence, the “quantized” thermal conductance becomes tunable in this system. This finding may achieve potential applications in designing novel thermal-conducting materials.
PACS: 63.50.-x – Vibrational states in disordered systems / 43.40.+s – Structural acoustics and vibration / 61.43.-j – Disordered solids
© EPLA, 2008
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