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DOI	10.1016/j.scib.2020.03.031
	Single-layer CrI3 grown by molecular beam epitaxy
	Li P.; Wang C.; Zhang J.; Chen S.; Guo D.; Ji W.; Zhong D.
发表日期	2020
ISSN	20959273
起始页码	1064
结束页码	1071
卷号	65 期号:13
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
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
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207103
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
推荐引用方式 GB/T 7714	Li P.,Wang C.,Zhang J.,et al. Single-layer CrI3 grown by molecular beam epitaxy[J],2020,65(13).
APA	Li P..,Wang C..,Zhang J..,Chen S..,Guo D..,...&Zhong D..(2020).Single-layer CrI3 grown by molecular beam epitaxy.Science Bulletin,65(13).
MLA	Li P.,et al."Single-layer CrI3 grown by molecular beam epitaxy".Science Bulletin 65.13(2020).