title: Observation of Strong Interlayer Coupling in MoS2/WS2 Heterostructures.
abstract: Epitaxial growth of A-A and A-B stacking MoS2 on WS2 via a two-step chemical vapor deposition method is reported. These epitaxial heterostructures show an atomic clean interface and a strong interlayer coupling, as evidenced by systematic characterization. Low-frequency Raman breathing and shear modes are observed in commensurate stacking bilayers for the first time; these can serve as persuasive fingerprints for interfacial quality and stacking configurations.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing, 100871, China.
authors.forename: Jinhuan
authors.initials: J
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Chen
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Wu
authors.affiliation: State Key Laboratory for Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.
authors.forename: Zhiyan
authors.initials: Z
authors.lastname: Jia
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Lu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Yu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Jianqi
authors.initials: J
authors.lastname: Zhu
authors.affiliation: National Key Laboratory of Science and Technology on Space Microwave, China Academy of Space Technology, Xi'an, 170100, China.
authors.forename: Guibai
authors.initials: G
authors.lastname: Xie
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Yang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Dongxia
authors.initials: D
authors.lastname: Shi
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Xiulai
authors.initials: X
authors.lastname: Xu
authors.affiliation: State Key Laboratory for Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.
authors.forename: Jianyong
authors.initials: J
authors.lastname: Xiang
authors.affiliation: State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing, 100871, China.|Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China.
authors.forename: Kaihui
authors.initials: K
authors.lastname: Liu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.|Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China.
authors.forename: Guangyu
authors.initials: G
authors.lastname: Zhang
keywords: MoS2/WS2; charge transfer; interlayer coupling; low-frequency Raman modes; photoluminescence spectra; van der Waals epitaxial heterostructures