Exotic Dielectric Behaviors Induced by Pseudo-Spin Texture in Magnetic Twisted Bilayer

凝聚态物理 电介质 电场 偶极子 扭转 双层石墨烯 材料科学 双层 极化密度 范德瓦尔斯力 电子 物理 磁场 纳米技术 化学 光电子学 石墨烯 磁化 几何学 数学 量子力学 分子 生物化学
作者
Yuhao Shen,Wen‐Yi Tong,Hu He,Jun‐Ding Zheng,Chun‐Gang Duan
出处
期刊:Chinese Physics Letters [Institute of Physics]
卷期号:38 (3): 037501-037501 被引量:13
标识
DOI:10.1088/0256-307x/38/3/037501
摘要

Twisted van der Waals bilayers provide an ideal platform to study the electron correlation in solids. Of particular interest is the 30° twisted bilayer honeycomb lattice system, which possesses an incommensurate moiré pattern, and uncommon electronic behaviors may appear due to the absence of phase coherence. Such a system is extremely sensitive to further twist and many intriguing phenomena will occur. Based on first-principles calculations we show that, for further twist near 30°, there could induce dramatically different dielectric behaviors of electron between left and right-twisted cases. Specifically, it is found that the left and right twists show suppressed and amplified dielectric response under vertical electric field, respectively. Further analysis demonstrate that such an exotic dielectric property can be attributed to the stacking dependent charge redistribution due to twist, which forms twist-dependent pseudospin textures. We will show that such pseudospin textures are robust under small electric field. As a result, for the right-twisted case, there is almost no electric dipole formation exceeding the monolayer thickness when the electric field is applied. Whereas for the left case, the system could even demonstrate negative susceptibility, i.e., the induced polarization is opposite to the applied field, which is very rare in the nature. Such findings not only enrich our understanding on moiré systems but also open an appealing route toward functional 2D materials design for electronic, optical and even energy storage devices.
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