论文标题
扭曲界面耦合的时间反转甚至充电厅效应
Time-Reversal Even Charge Hall Effect from Twisted Interface Coupling
论文作者
论文摘要
在时间反转对称性下，通常认为线性充电厅响应被Onsager关系禁止。在这项工作中，我们发现了一种场景，用于实现时间反转甚至是线性充电厅效应，这是由时间逆转对称性允许的非差异二维晶体。通过与相邻层的界面耦合来取消对Onsager关系的限制，在该层面上，通过扭曲的堆叠来满足整体手性对称性的需求。我们揭示了基本的带几何数量作为层电流的动量空间涡度。在扭曲的双层石墨烯和具有各种扭曲角的扭曲的双层石墨烯和扭曲的同叶型金属二进制二进制二进制二进制中，该效果在实验上实用的条件下表现出巨大的霍尔比，并具有栅极电压控制的开关开关。这项工作揭示了手性结构中有趣的霍尔物理学，并打开了层基因研究的研究方向，从而利用了层层自由度的量子性质，以发现令人兴奋的效果。
Under time-reversal symmetry, a linear charge Hall response is usually deemed to be forbidden by the Onsager relation. In this work, we discover a scenario for realizing a time-reversal even linear charge Hall effect in a non-isolated two-dimensional crystal allowed by time reversal symmetry. The restriction by Onsager relation is lifted by interfacial coupling with an adjacent layer, where the overall chiral symmetry requirement is fulfilled by a twisted stacking. We reveal the underlying band geometric quantity as the momentum-space vorticity of layer current. The effect is demonstrated in twisted bilayer graphene and twisted homobilayer transition metal dichalcogenides with a wide range of twist angles, which exhibit giant Hall ratios under experimentally practical conditions, with gate voltage controlled on-off switch. This work reveals intriguing Hall physics in chiral structures, and opens up a research direction of layertronics that exploits the quantum nature of layer degree of freedom to uncover exciting effects.
