粗糙势能对Frenkel-Kontorova晶格热传导性能的影响

采用非线性分子动力学方法，通过计算机模拟，研究了粗糙势能的高度和频率对Frenkel-Kontorova晶格负微分热阻和热导率的影响.结果表明:粗糙势的高度和频率减小了负微分热阻(NDTR)出现的范围；热导率是粗糙势能高度和频率的函数，存在一个最佳的粗糙势能高度，热导率达到最大值；热导率随着粗糙势能频率的增加而单调降低.研究结果揭示了粗糙势能对热传导性能的影响，对低维材料非线性反应机制及热流控制器的应用研究具有参考价值.

The Effect of Rough Potential Energy on the Thermal Conductivity of Frenkel-Kontorova Lattice

The effects of the height and frequency of rough potential energy on the negative differential thermal resistance and thermal conductivity of Frenkel-Kontorova lattice were studied through computer simulation using the nonlinear molecular dynamics method. The results are as follows. First, the height and frequency of the rough potential reduce the appearance range of negative differential thermal resistance (NDTR). Second, the thermal conductivity is a function of the height and frequency of the rough potential energy, and there exists an optimal height of the rough potential energy where the thermal conductivity reaches the maximum value. And third, the thermal conductivity decreases monotonically with the increase of the rough potential energy frequency. The research results reveal the effect of rough potential energy on heat conduction and can be reference for the study of the nonlinear response mechanism of low-dimensional materials and the application of heat flow controllers.