凝聚态物理
霍尔效应
量子霍尔效应
铁磁性
格子(音乐)
量子反常霍尔效应
六边形晶格
六方晶系
磁化
量子自旋霍尔效应
物理
电阻率和电导率
磁场
化学
量子力学
结晶学
反铁磁性
声学
作者
Zhonglin He,Rui Peng,Ying Dai,Baibiao Huang,Yandong Ma
摘要
Valley-related multiple Hall effect in two-dimensional lattice is of notable interest both for its fundamental physics and for its potential applications. In this work, by means of a low energy kp model analysis, a mechanism of producing valley-related multiple Hall effect in hexagonal lattice via strain engineering is proposed, and a general picture of valley-contrasted band inversion is developed. Through first-principles calculations, this mechanism is further established in a ferromagnetic hexagonal lattice of single-layer ScI2. Single-layer ScI2 prefers in-plane magnetization and exhibits neither anomalous valley Hall effect nor valley-polarized quantum anomalous Hall effect in nature. Remarkably, these two Hall effects emerge simultaneously in this system under 4.705% tensile strain and disappear simultaneously when further increasing strain, suggesting the exotic valley-related multiple Hall effect. The underlying physical mechanism is revealed using a model analysis and is generally applicable. Our work greatly enriches the valley-related physics.
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