杰纳斯
Valleytronics公司
凝聚态物理
材料科学
磁性
点反射
自旋电子学
范德瓦尔斯力
单层
过渡金属
钒
极化(电化学)
压电
铁磁性
纳米技术
物理
化学
量子力学
冶金
生物化学
催化作用
复合材料
物理化学
分子
作者
Guodong Zhao,Weida Fu,Yongchang Li,Xingen Liu,Fanhao Jia,Tao Hu,Wei Ren
标识
DOI:10.1021/acsami.3c09270
摘要
Due to the lack of inversion symmetry and the discovery of room-temperature ferromagnetism, two-dimensional semiconducting vanadium-based van der Waals transition-metal dichalcogenides (V-TMDs) are drawing attention for their possible application in spintronics and valleytronics. Here, we show the functional properties enriched by the broken inversion, out-of-plane mirror, and time-reversal symmetries of Janus H–VXY TMDs (X, Y = S, Se, Te). By first-principles calculations, we reveal the intrinsic xy easy-plane magnetism of the Janus vanadium-based TMD monolayers and systematically study their hidden valley polarization and giant magneto band structure. Their strong nearest-neighbor exchange strengths lead to near-room-temperature magnetic phase transitions. The Janus H–VXY system also exhibits piezoelectricity with nonzero e31 and e21. Interestingly, it is found that the right-handed Dzyaloshinskii–Moriya interaction has nonzero in-plane components in our Janus system, with fluctuating magnitudes determined by competence between relaxed bond-angle and atomic index of ligands.
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