DOI: 10.1016/j.scib.2020.03.031
论文题名: Single-layer CrI3 grown by molecular beam epitaxy
作者: Li P. ; Wang C. ; Zhang J. ; Chen S. ; Guo D. ; Ji W. ; Zhong D.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 13 起始页码: 1064
结束页码: 1071
语种: 英语
中文关键词: CrI3
; Molecular beam epitaxy
; Scanning tunneling microscopy
; Two-dimensional magnetic materials
英文关键词: Density functional theory
; Magnetic materials
; Molecular beam epitaxy
; Molecular beams
; Scanning tunneling microscopy
; CrI3
; DFT calculation
; Direct growth
; Elevated temperature
; Graphite substrate
; Mechanical exfoliation
; Single layer
; Superexchange interaction
; Chromium compounds
英文摘要: Single- and few-layer chromium triiodide (CrI3), which has been intensively investigated as a promising platform for two-dimensional magnetism, is usually prepared by the mechanical exfoliation. Here, we report direct growth of single-layer CrI3 using molecular beam epitaxy in ultrahigh vacuum. Scanning tunneling microscopy (STM), together with density functional theory (DFT) calculation, revealed that the iodine trimers, each of which consists of three I atoms surrounding a three-fold Cr honeycomb center, are the basic units of the topmost I layer. Different superstructures of single-layer CrI3 with periodicity around 2–4 nm were obtained on Au(1 1 1), while only the 1 × 1 structure was observed on the graphite substrate. At an elevated temperature of 423 K, single-layer CrI3 began to decompose and transformed into single-layer chromium diiodide. Our bias-dependent STM images suggest that the unoccupied and occupied states are spatial-separately distributed, consistent with the results of our DFT calculation. We also discussed the role of charge distribution in the super-exchange interactions among Cr atoms in single-layer CrI3. © 2020 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169959
Appears in Collections: 气候变化与战略
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作者单位: School of Physics, Sun Yat-sen University, Guangzhou, 510275, China; Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Department of Physics, Renmin University of China, Beijing, 100872, China; State Key Laboratory for Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou, 510275, China
Recommended Citation:
Li P.,Wang C.,Zhang J.,et al. Single-layer CrI3 grown by molecular beam epitaxy[J]. Science Bulletin,2020-01-01,65(13)