Heat conduction in disordered anharmonic systems

✍ Scribed by Harald Böttger; Thomas Damker; Reinhard Poetzsch

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 214 KB
• Volume: 219-220
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(95)00741-5

✦ Synopsis

The heat transport of (2D) disordered dielectric model systems in the high-temperature regime is studied in two respects. Firstly, we find that the heat conductivity due to hopping of localized phonons increases linearly with the temperature up to a "saturated" value, which emerges at certain strengths of the coupling with the extended phonons. Secondly, third-or fourthorder anharmonicity is shown to lower or enhance the conductivity, respectively, which can be understood by weakening or strengthening of the stiffness of the bonds in the system.