Li Ying, Shen Xiangying, Wu Zuhui, Huang Junying, Chen Yixuan, Ni Yushan, Huang Jiping
Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, China.
Department of Physics, State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), and Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China.
Phys Rev Lett. 2015 Nov 6;115(19):195503. doi: 10.1103/PhysRevLett.115.195503. Epub 2015 Nov 5.
The macroscopic control of ubiquitous heat flow remains poorly explored due to the lack of a fundamental theoretical method. Here, by establishing temperature-dependent transformation thermotics for treating materials whose conductivity depends on temperature, we show analytical and simulation evidence for switchable thermal cloaking and a macroscopic thermal diode based on the cloaking. The latter allows heat flow in one direction but prohibits the flow in the opposite direction, which is also confirmed by our experiments. Our results suggest that the temperature-dependent transformation thermotics could be a fundamental theoretical method for achieving macroscopic heat rectification, and it could provide guidance both for the macroscopic control of heat flow and for the design of the counterparts of switchable thermal cloaks or macroscopic thermal diodes in other fields like seismology, acoustics, electromagnetics, and matter waves.
由于缺乏基本的理论方法，对普遍存在的热流的宏观控制仍未得到充分探索。在此，通过建立依赖于温度的变换热学来处理电导率取决于温度的材料，我们展示了可切换热隐身及基于该隐身的宏观热二极管的分析和模拟证据。后者允许热流沿一个方向流动，但禁止反向流动，这也得到了我们实验的证实。我们的结果表明，依赖于温度的变换热学可能是实现宏观热整流的一种基本理论方法，它可为热流的宏观控制以及在地震学、声学、电磁学和物质波等其他领域中可切换热隐身或宏观热二极管的对应物设计提供指导。
