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|Title:||Temperature dependence of thermal conductivity in 1D nonlinear lattices|
|Authors:||Li, N. |
|Source:||Li, N., Li, B. (2007-05-01). Temperature dependence of thermal conductivity in 1D nonlinear lattices. EPL 78 (3) : -. ScholarBank@NUS Repository. https://doi.org/78/34001|
|Abstract:||We examine the temperature dependence of thermal conductivity of one-dimensional nonlinear (anharmonic) lattices with and without on-site potential. It is found from computer simulation that the heat conductivity depends on temperature via the strength of nonlinearity. Based on this correlation, we make a conjecture in the effective phonon theory that the mean-free-path of the effective phonon is inversely proportional to the strength of nonlinearity. We demonstrate analytically and numerically that the temperature behavior of the heat conductivity κ 1/T is not universal for 1D harmonic lattices with a small nonlinear perturbation. The computer simulations of temperature dependence of heat conductivity in general 1D nonlinear lattices are in good agreement with our theoretic predictions. Possible experimental tests are discussed. © Europhysics Letters Association.|
|Appears in Collections:||Staff Publications|
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