铁电性
异质结
极化(电化学)
范德瓦尔斯力
各向异性
凝聚态物理
材料科学
电场
多铁性
基质(水族馆)
光电子学
化学
物理
光学
地质学
海洋学
有机化学
物理化学
量子力学
分子
电介质
作者
Yunxi Qi,Jun Zhao,Hui Zeng
摘要
It is highly desirable to tune valley-related property through reversible and electrically nonvolatile methods. Taking the VSiGeP4/Al2S3 heterostructure as an example, we demonstrate that the valley splitting and valley-contrasting transport in VSiGeP4 monolayer are significantly enhanced by using a ferroelectric Al2S3 substrate. The vertical strain and electric field can modulate valley splitting, magnetic anisotropy, and magnetic ground state. The valley splitting is mainly governed by charge transfer between the two sublayers. The valley splitting and valley-contrasting transport are highly tunable when the ferroelectric polarization state of the Al2S3 substrate is the upward direction. In contrast, the valley splitting is rather robust when the ferroelectric polarization state is switched to the opposite direction. Furthermore, we propose to use electrical conversion between two opposite ferroelectric polarization states to obtain nonvolatile control of valley-related properties. Our research provides a proof-of-concept scheme to achieve electrical control based on multiferroic van der Waals heterostructures.
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