Spontaneous Valley Polarization in a Ferromagnetic Fe(OH)2 Monolayer

At present, creating sizable spontaneous valley polarization is at the center of the study of valleytronics, which, however, is still a huge challenge. In this work, we determined that the ferromagnetic Fe­(OH)2 monolayer of the hexagonal lattice is a highly appealing candidate for valleytronics by...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2022-12, Vol.13 (49), p.11543-11550
Main Authors: Xu, Yushuo, Wang, Shuhua, Yu, Shiqiang, Wang, Xinxin, Huang, Baibiao, Dai, Ying, Wei, Wei
Format: Article
Language:English
Subjects:
Physical Insights into Materials and Molecular Properties
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Summary:At present, creating sizable spontaneous valley polarization is at the center of the study of valleytronics, which, however, is still a huge challenge. In this work, we determined that the ferromagnetic Fe­(OH)2 monolayer of the hexagonal lattice is a highly appealing candidate for valleytronics by using first-principles calculations in conjunction with tight-binding model analysis. In light of the simultaneous inversion symmetry breaking and time-reversal symmetry breaking, we illustrated that the strong spin–orbit coupling and robust ferromagnetic exchange interaction cause a spontaneous valley polarization as large as 67 meV for Fe­(OH)2, indicative of room-temperature application. In addition, the physics of valley-selective circular dichroism, spin/valley Hall effects, and topological phase transition were also discussed.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.2c03177