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|Title:||Effective phonons in anharmonic lattices: Anomalous vs. normal heat conduction|
|Authors:||Li, N. |
|Source:||Li, N., Tong, P., Li, B. (2006-07-01). Effective phonons in anharmonic lattices: Anomalous vs. normal heat conduction. Europhysics Letters 75 (1) : 49-55. ScholarBank@NUS Repository. https://doi.org/epl/i2006-10079-7|
|Abstract:||We study heat conduction in one-dimensional (1D) anharmonic lattices analytically and numerically by using an effective phonon theory. It is found that every effective phonon mode oscillates quasi-periodically. By weighting the power spectrum of the total heat flux in the Debye formula, we obtain a unified formalism that can explain anomalous heat conduction in momentum conserved lattices without on-site potential and normal heat conduction in lattices with on-site potential. Our results agree very well with numerical ones for existing models such as the Fermi-Pasta-Ulam model, the Prenkel-Kontorova model and the Φ4 model etc. © EDP Sciences.|
|Source Title:||Europhysics Letters|
|Appears in Collections:||Staff Publications|
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