title: Monolayer PtSe₂, a New Semiconducting Transition-Metal-Dichalcogenide, Epitaxially Grown by Direct Selenization of Pt.
abstract: Single-layer transition-metal dichalcogenides (TMDs) receive significant attention due to their intriguing physical properties for both fundamental research and potential applications in electronics, optoelectronics, spintronics, catalysis, and so on. Here, we demonstrate the epitaxial growth of high-quality single-crystal, monolayer platinum diselenide (PtSe2), a new member of the layered TMDs family, by a single step of direct selenization of a Pt(111) substrate. A combination of atomic-resolution experimental characterizations and first-principle theoretic calculations reveals the atomic structure of the monolayer PtSe2/Pt(111). Angle-resolved photoemission spectroscopy measurements confirm for the first time the semiconducting electronic structure of monolayer PtSe2 (in contrast to its semimetallic bulk counterpart). The photocatalytic activity of monolayer PtSe2 film is evaluated by a methylene-blue photodegradation experiment, demonstrating its practical application as a promising photocatalyst. Moreover, circular polarization calculations predict that monolayer PtSe2 has also potential applications in valleytronics.
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|¶Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Yeliang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Linfei
authors.initials: L
authors.lastname: Li
authors.affiliation: ‡State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Yao
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Shiru
authors.initials: S
authors.lastname: Song
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: J T
authors.initials: JT
authors.lastname: Sun
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Jinbo
authors.initials: J
authors.lastname: Pan
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Ren
authors.affiliation: §Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
authors.forename: Chen
authors.initials: C
authors.lastname: Li
authors.affiliation: ⊥EM Business Unit, JEOL Ltd., Tokyo 196-8558, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Okunishi
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yu-Qi
authors.initials: YQ
authors.lastname: Wang
authors.affiliation: ‡State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Eryin
authors.initials: E
authors.lastname: Wang
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Shao
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|§Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.|∥Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors.forename: Y Y
authors.initials: YY
authors.lastname: Zhang
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Hai-tao
authors.initials: HT
authors.lastname: Yang
authors.affiliation: ∇Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-0046, Japan.
authors.forename: Eike F
authors.initials: EF
authors.lastname: Schwier
authors.affiliation: ∇Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-0046, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Iwasawa
authors.affiliation: ∇Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-0046, Japan.
authors.forename: Kenya
authors.initials: K
authors.lastname: Shimada
authors.affiliation: ∇Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-0046, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Taniguchi
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Zhaohua
authors.initials: Z
authors.lastname: Cheng
authors.affiliation: ‡State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China.|¶Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Shuyun
authors.initials: S
authors.lastname: Zhou
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|¶Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Shixuan
authors.initials: S
authors.lastname: Du
authors.affiliation: ○Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 Singapore.
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Pennycook
authors.affiliation: §Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.|∥Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, United States.
authors.forename: Sokrates T
authors.initials: ST
authors.lastname: Pantelides
authors.affiliation: †Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|¶Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Hong-Jun
authors.initials: HJ
authors.lastname: Gao
mesh_terms: D055668:Photochemical Processes; D010984:Platinum / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry*; D012666:Semiconductors
chemical_list: D018036:Selenium Compounds; D010984:Platinum
keywords: PtSe2; epitaxial growth; monolayer; photocatalyst; transition-metal dichalcogenides; two-dimensional materials