扭曲范德华几层中的动态手性内斯特效应

Juncheng Li, Dawei Zhai, Cong Xiao, Wang Yao
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摘要

奈恩斯特效应是一种基本的热电转换现象,过去被认为只有在具有磁场或磁化的系统中才有可能发生。在这项工作中,我们提出了一种新的动态手性恩斯特效应,这种效应可以出现在具有手性结构对称性的二维范德华材料中,而且不存在任何磁自由度。这种非常规效应由平面外电场的时间变化触发,其内在的量子几何起源不仅与层内质量中心运动有关,还与电子态的层间相干性有关。我们在扭曲的同双层和同三层过渡金属二钙化物中演示了这一效应,其中强扭曲层间耦合导致了相当大的本征内能斯特电导率,远在实验容量范围之内。这项工作为热电转换的电气控制提供了一条新途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Dynamical chiral Nernst effect in twisted Van der Waals few layers

The Nernst effect is a fundamental thermoelectric conversion phenomenon that was deemed to be possible only in systems with magnetic field or magnetization. In this work, we propose a novel dynamical chiral Nernst effect that can appear in two-dimensional van der Waals materials with chiral structural symmetry in the absence of any magnetic degree of freedom. This unconventional effect is triggered by time variation of an out-of-plane electric field, and has an intrinsic quantum geometric origin linked to not only the intralayer center-of-mass motion but also the interlayer coherence of electronic states. We demonstrate the effect in twisted homobilayer and homotrilayer transition metal dichalcogenides, where the strong twisted interlayer coupling leads to sizable intrinsic Nernst conductivities well within the experimental capacity. This work suggests a new route for electric control of thermoelectric conversion.

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