title: Controlled Synthesis of Two-Dimensional 1T-TiSe2with Charge Density Wave Transition by Chemical Vapor Transport.
abstract: Two-dimensional (2D) metallic transition metal dichalcogenides (TMDCs), such as 1T-TiSe2, are ideal systems for exploring the fundamentals in condensed matter physics. However, controlled synthesis of these ultrathin materials has not been achieved. Here, we explored the synthesis of charge density wave (CDW)-bearing 2D TiSe2with chemical vapor transport (CVT) by extending this bulk crystal growth approach to the surface growth of TiSe2by introducing suitable growth substrates and dramatically slowing down the growth rate. Sub-10 nm TiSe2flakes were successfully obtained, showing comparable quality to the mechanically exfoliated thin flakes. A CDW state with 2 × 2 superstructure was clearly observed on these ultrathin flakes by scanning tunneling microscopy (STM), and the phase transition temperature of these flakes was investigated by transport measurements, confirming the existence of CDW states. Our work opens up a new approach to synthesizing 2D CDW and superconductive TMDCs for exploring new fundamentals and applications in novel electronics.
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Jingyi
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Physics, Center for Soft Matter and Biological Physics, Virginia Polytechnic Institute and State University , Blacksburg, Virginia 24061, United States.
authors.forename: Husong
authors.initials: H
authors.lastname: Zheng
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Guanchen
authors.initials: G
authors.lastname: Xu
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Lifei
authors.initials: L
authors.lastname: Sun
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Dake
authors.initials: D
authors.lastname: Hu
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Zhixing
authors.initials: Z
authors.lastname: Lu
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Lina
authors.initials: L
authors.lastname: Liu
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Jingying
authors.initials: J
authors.lastname: Zheng
authors.affiliation: Department of Physics, Center for Soft Matter and Biological Physics, Virginia Polytechnic Institute and State University , Blacksburg, Virginia 24061, United States.
authors.forename: Chenggang
authors.initials: C
authors.lastname: Tao
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Liying
authors.identifier: 0000-0002-6576-906X
authors.initials: L
authors.lastname: Jiao