论文标题
单层2H-FECL2中的固有山谷极化和异常山谷大厅效应
Intrinsic Valley Polarization and Anomalous Valley Hall Effect in Single-Layer 2H-FeCl2
论文作者
论文摘要
作为电子的新自由度，山谷由于其编码和存储信息的巨大潜力而引起了人们的关注。提升能量退化以实现山谷极化对于实现谷化设备是必要的。在这里，根据第一原理的计算，我们表明单层FECL2表现出较大的自发山谷极化（〜101 MEV），这是由于破损的时间反向对称性和自旋轨道耦合而产生的，可以通过改变磁性晶体的方向来连续调谐。通过采用扰动理论，揭示了潜在的物理机制。此外，在面积内电场的存在下，山谷自由度与铁磁秩序之间的耦合可能会产生自旋和谷极化的异源霍尔电流，从而促进其实验探索和实际应用。
Valley, as a new degree of freedom for electrons, has drawn considerable attention due to its significant potential for encoding and storing information. Lifting the energy degeneracy to achieve valley polarization is necessary for realizing valleytronic devices. Here, on the basis of first-principles calculations, we show that single-layer FeCl2 exhibits a large spontaneous valley polarization (~101 meV) arising from the broken time-reversal symmetry and spin-orbital coupling, which can be continuously tuned by varying the direction of magnetic crystalline. By employing the perturbation theory, the underlying physical mechanism is unveiled. Moreover, the coupling between valley degree of freedom and ferromagnetic order could generate a spin- and valley-polarized anomalous Hall current in the presence of the in-plane electric field, facilitating its experimental exploration and practical applications.
