MXene单层中磁电可控的谷劈裂
Magnetically and electrically controllable valley splittings in MXene monolayers
AI总结：
本文基于第一性原理研究多铁性Co$_2$CF$_2$ MXene单层的谷劈裂，发现H$^{\prime}$相和T$^{\prime}$相均可通过磁化方向旋转和电场调控谷劈裂的大小与符号，为谷电子学提供了多铁耦合调控新途径。
摘要：
二维谷材料中谷结构的调控在谷电子学领域至关重要。多铁性为谷的多重调控提供了可能性，包括磁和电的手段。基于第一性原理计算，我们研究了具有不同堆叠模式的多铁性Co$_2$CF$_2$单层的谷性质及相关操控。我们的计算表明，H$^{\prime}$相的Co$_2$CF$_2$单层是一种铁谷材料，具有可观的谷劈裂。通过旋转磁化方向，可以同时调控谷劈裂的大小和符号。电场驱动电极化反转，也可以改变谷劈裂的大小。此外，亚稳态的T$^{\prime}$相也表现出谷劈裂，其大小和符号可以通过外加磁场和电场同时控制。这些发现为实现多铁性耦合下的高度可调谷提供了一条实用途径。
英文摘要：
The modulation of the valley structure in two-dimensional valley materials is vital in the field of valleytronics. The multiferroicity provides possibility for multiple modulations of the valley, including the magnetic and electric means. Based on the first-principle calculations, we study the valley properties and associated manipulations of multiferroic Co$_2$CF$_2$ monolayers with different stacking patterns. Our calculations show that the Co$_2$CF$_2$ monolayer in the H$^{\prime}$ phase is a ferrovalley material, with sizable valley splittings. By rotating the magnetization direction, the valley splittings can be tuned for both the magnitude and sign. The electric field, driving the reversal of the electric polarization, can also change the magnitude of the valley splittings. Besides, a metastable T$^{\prime}$ phase exhibits valley splittings as well, of which the magnitude and sign can be simultaneously controlled by applied magnetic and electric fields. These findings offer a practical way for realizing highly tunable valleys by multiferroic couplings.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
