期刊
PHYSICAL REVIEW B
卷 101, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.060404
关键词
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资金
- Office of Department of Energy, Basic Energy Sciences [ER-46612]
- DARPA [HR0011727183-D18AP00010]
- NSFC [11825403]
- Special Funds for Major State Basic Research [2015CB921700]
- Program for Professor of Special Appointment (Eastern Scholar)
- Qing Nian Ba Jian Program
- Fok Ying Tung Education Foundation
- Anhui Provincial Natural Science Foundation [1908085MA10]
Topological magnetic states are promising for ultradense memory and logic devices. Recent progress in two-dimensional magnets encourages the idea to realize topological states, such as skyrmions and merons, in freestanding monolayers. However, monolayers such as CrI3 lack Dzyaloshinskii-Moriya interactions (DMIs) and thus do not naturally exhibit skyrmions/merons but rather a ferromagnetic state. Here we propose the fabrication of Cr(I, X)(3) Janus monolayers, in which the Cr atoms are covalently bonded to the underlying I ions and top-layer Br or Cl atoms. By performing first-principles calculations and Monte Carlo simulations, we identify strong enough DMIs, which leads to not only helical cycloid phases, but also to topologically nontrivial states, such as the intrinsic domain wall skyrmions in Cr(I, Br)(3) and the magnetic-field-induced bimerons in Cr(I, Cl)(3). Microscopic origins of such spin textures are revealed as well.
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