期刊
NANO LETTERS
卷 19, 期 2, 页码 1366-1370出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b05050
关键词
VSSe; piezoelectric; valley; ferroelasticity; ferromagnetic
类别
资金
- Australian Research Council [DP170103598]
- Australian Government
- Government of Western Australia
- Science Foundation Ireland [14/IA/2624]
- Science Foundation Ireland (SFI) [14/IA/2624] Funding Source: Science Foundation Ireland (SFI)
Inspired by recent experiments on the successful fabrication of monolayer Janus transition-metal dichalcogenides [Lu, A.-Y.; et al. Nat. Nanotechnol. 2017, 12, (8), 744 and ferromagnetic VSe2 [Bonilla, M.; et al. Nat. Nanotechnol. 2018, 13, (4), 289], we predict a highly stable room-temperature ferromagnetic Janus monolayer (VSSe) by density functional theory methods and further confirmed the stability by a global minimum search with the particle-swarm optimization method. The VSSe monolayer exhibits a large valley polarization due to the broken space- and time-reversal symmetry. Moreover, its low symmetry C-3v point group results in giant in-plane piezoelectric polarization. Most interestingly, a strain-driven 90 degrees lattice rotation is found in the magnetic VSSe monolayer with an extremely high reversal strain (73%), indicating an intrinsic ferroelasticity. The combination of piezoelectricity and valley polarization make magnetic 2D Janus VSSe a tantalizing material for potential applications in nanoelectronics, optoelectronics, and valleytronics.
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