Anharmonic on-site potential implies asymmetry thermal transport in 1D mass-graded harmonic lattice

作者：Hu, Tao; Hu, Ke; Tang, Yi^*

来源：Physica B: Condensed Matter , 2010, 405(21): 4407-4412.

DOI：10.1016/j.physb.2010.08.003

• Heat conduction
• Thermal rectification
• Transport properties

Exploring the thermal rectification in one-dimensional (1D) lattice model is of considerable practical importance. Here we consider the 1D mass-graded harmonic lattice with on-site potential. By the nonequilibrium molecular dynamics simulation, it is uncovered that the temperature gradient is formed regardless of the fact that the on-site potential is harmonic or anharmonic. Differently, the thermal rectification rises in the model with anharmonic on-site potential whereas disappears with harmonic one. Moreover, we find that the heat flux of 1D mass-graded Frenkel-Kontorova (FK) model in the direction of mass increasing is larger than that in the direction of mass decreasing. Our results further emphasize that nonlinearity is necessary for thermal rectification.

• 出版日期2010-11-1
• 单位湘潭大学