Hu Bambi, Yang Lei, Zhang Yong
Department of Physics, Centre for Nonlinear Studies, and The Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems (Hong Kong), Hong Kong Baptist University, Kowloon Tong, Hong Kong, China.
Phys Rev Lett. 2006 Sep 22;97(12):124302. doi: 10.1103/PhysRevLett.97.124302. Epub 2006 Sep 18.
In this Letter, we conduct an extensive study of the two-segment Frenkel-Kontorova model. We show that the rectification effect of the heat flux reported in recent literature is possible only in the weak interfacial coupling limit. The rectification effect will be reversed when the properties of the interface and the system size change. These two types of asymmetric heat conduction are governed by different mechanisms though both are induced by nonlinearity. An intuitive physical picture is proposed to interpret the reversal of the rectification effect. Since asymmetric heat conduction depends critically on the properties of the interface and the system size, it is probably not an easy task to fabricate a thermal rectifier or thermal diode in practice.
在本信函中，我们对两段式弗伦克尔-康托洛娃模型进行了广泛研究。我们表明，近期文献中报道的热流整流效应仅在弱界面耦合极限下才有可能实现。当界面性质和系统尺寸发生变化时，整流效应将会反转。这两种类型的非对称热传导由不同机制支配，尽管两者均由非线性引起。我们提出了一个直观的物理图像来解释整流效应的反转。由于非对称热传导严重依赖于界面性质和系统尺寸，因此在实际中制造热整流器或热二极管可能并非易事。
