文献类型：期刊文献

英文题名：A van der Waals epitaxial growth of ultrathin two-dimensional Sn film on graphene covered Cu(111) substrate

作者：Wu, Haifei[1];Tang, Jiahao[1];Liang, Qifeng[1];Shi, Biyun[1];Niu, Yixiao[1];Si, Jianxiao[2];Liao, Qing[3];Dou, Weidong[1]

机构：[1]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[2]Zhejiang Normal Univ, Dept Phys, Jinhua 321004, Zhejiang, Peoples R China;[3]Hezhou Univ, Sch Informat & Commun Engn, Hezhou 542899, Peoples R China

年份：2019

卷号：115

期号：14

外文期刊名：APPLIED PHYSICS LETTERS

收录：SCI-EXPANDED(收录号：WOS:000489308600035)、、EI(收录号：20194107506800)、Scopus(收录号：2-s2.0-85072941706)、WOS

基金：The work described in this paper was supported by grants from the National Natural Science Foundation of China (Nos. 61474077 and 11464051) and the Natural Science Foundation of Zhejiang Province (Nos. LY19F040005 and LY19E020009).

语种：英文

外文关键词：Bismuth compounds - Film growth - Graphene - IV-VI semiconductors - Molecular beam epitaxy - Monolayers - Physical properties - Quantum Hall effect - Spin Hall effect - Substrates - Ultrathin films - Van der Waals forces

外文摘要：Two-dimensional (2D) ultrathin gray tin (alpha-Sn) has attracted intense research efforts owing to its fascinating physical properties such as high-temperature quantum spin Hall effects, high thermoelectricity, topological superconductivity, and so on. Although monolayer alpha-Sn was achieved on substrates like Bi2Te3(111), Cu(111), Ag(111), and PbTe(111), the above-mentioned physical properties of alpha-Sn were lost due to strong Sn-substrate coupling. For promising applications of 2D Sn, it is necessary to decouple the Sn film from the substrate in order to retain the intrinsic properties of the 2D Sn film. Here, we grew ultrathin Sn films (about 6 A) on monolayer-graphene (MLG) covered Cu(111) by using molecular beam epitaxy. It was found that the van der Waals (vdW) epitaxial growth behavior was enhanced due to the template-effect of MLG, leading to the development of the 2D Sn film with a uniform thickness and continuous morphology. In addition, we also observed that the 2D Sn film on the MLG substrate is long-term stable in air. Our study provides a promising approach toward the controllable fabrication of high-quality 2D Sn films.