论文标题
多能Helimagnet中的非肾脏热传输
Nonreciprocal thermal transport in a multiferroic helimagnet
论文作者
论文摘要
空间反演对称性（SIS）的破坏会在凝结物质中诱导独特的现象。除了经典的示例（例如自然光活性和压电性）外，自旋轨道相互作用进一步增强了SIS破裂的影响，这是Rashba效应的例证。特别是，通过将这种对称性与磁场或其他类型的时间反向对称性（TRS）结合，可以使非中心对称材料表现出非偏置响应，这些响应的响应是向右和向左刺激的响应。例如，电阻率在方向上依赖。也就是说，在磁场中的非中心对称材料中出现了整流。但是，SIS破裂对热传输的影响仍有待阐明。在这里，我们在多效Helimagnet TBMNO3中显示非肾脏热传输。纵向热导率取决于热电流是平行还是与电化和磁化的矢量产物平行的。这种现象是热矫正，可以用均匀晶体中的外侧控制。这一发现可能会为具有可控性和可伸缩性的热二极管铺平道路。
Breaking of spatial inversion symmetry (SIS) induces unique phenomena in condensed matter. Besides the classic examples such as natural optical activity and piezoelectricity, the spin-orbit interaction further enriches the effect of SIS breaking, as exemplified by the Rashba effect. In particular, by combining this symmetry with magnetic fields or another type of time-reversal symmetry (TRS) breaking, noncentrosymmetric materials can be made to exhibit nonreciprocal responses, which are responses that differ for rightward and leftward stimuli. For example, resistivity becomes directionally dependent; that is to say, rectification appears in noncentrosymmetric materials in a magnetic field. However, the effect of SIS breaking on thermal transport remains to be elucidated. Here we show nonreciprocal thermal transport in the multiferroic helimagnet TbMnO3. The longitudinal thermal conductivity depends on whether the thermal current is parallel or antiparallel to the vector product of the electric polarization and magnetization. This phenomenon is thermal rectification that is controllable with external fields in a uniform crystal. This discovery may pave the way to thermal diodes with controllability and scalability.
