平面霍尔效应的层相干起源：从电荷到多极与谷
Layer Coherence Origin of Planar Hall Effect: from Charge to Multipole and Valley
AI总结：
本研究发现二维范德华薄膜中层相干电子可作为平面霍尔效应的新起源，可通过应变、层间滑动调控，还能拓展至多极、谷霍尔效应及量子化霍尔响应，为二维材料平面输运研究提供新方向。
摘要：
我们揭示了平面霍尔效应的一个新起源——作为层相干电子的本征属性——该效应甚至存在于双层、三层原子级厚度的极限体系中。它修正了现有理论中需要三维轨道运动或特定形式强自旋轨道耦合的前提，而这两类条件在范德华薄膜中均不存在。我们举例证明，在转角结构中，应变和层间滑动可触发该效应，具备丰富的可调性与较强的效应幅值。此外，这种层相干机制拓展了概念框架，可涵盖平面多极霍尔效应，以及由面内赝磁场诱导的谷霍尔效应，超越了现有机制的范畴。该层机制还为实现面内磁场诱导拓扑相变下的量子化霍尔响应提供了新途径。这些结果展现了量子层电子学和莫尔平带在二维材料平面输运领域尚未被发掘的潜力。
英文摘要：
We uncover a new origin of the planar Hall effect - as an intrinsic property of layer coherent electrons - that exists even in bilayer and trilayer atomically thin limit. It reforms the existing theories requiring three-dimensional orbital motion, or strong spin-orbit coupling of certain forms, which are absent in van der Waals thin films. We exemplify that the effect can be triggered by strain and interlayer sliding in twisted structures with rich tunability and strong magnitudes. Furthermore, this layer coherence mechanism broadens the conceptual framework to include planar multipole Hall effect, and valley Hall effect induced by in-plane pseudo-magnetic field, outreaching the existing mechanisms. The layer mechanism also provides a new route towards quantized Hall response upon a topological phase transition induced by in-plane magnetic field. These results unveil the unexplored potential of quantum layertronics and moiré flat band for planar transport in 2D materials.
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