title: Experimental Observation of Topological Edge States at the Surface Step Edge of the Topological Insulator ZrTe_{5}.
abstract: We report an atomic-scale characterization of ZrTe_{5} by using scanning tunneling microscopy. We observe a bulk band gap of ∼80  meV with topological edge states at the step edge and, thus, demonstrate that ZrTe_{5} is a two-dimensional topological insulator. We also find that an applied magnetic field induces an energetic splitting of the topological edge states, which can be attributed to a strong link between the topological edge states and bulk topology. The relatively large band gap makes ZrTe_{5} a potential candidate for future fundamental studies and device applications.
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Xiang-Bing
authors.initials: XB
authors.lastname: Li
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Wen-Kai
authors.initials: WK
authors.lastname: Huang
authors.affiliation: National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Yang-Yang
authors.initials: YY
authors.lastname: Lv
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Kai-Wen
authors.initials: KW
authors.lastname: Zhang
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Chao-Long
authors.initials: CL
authors.lastname: Yang
authors.affiliation: National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Bin-Bin
authors.initials: BB
authors.lastname: Zhang
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Y B
authors.initials: YB
authors.lastname: Chen
authors.affiliation: National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Shu-Hua
authors.initials: SH
authors.lastname: Yao
authors.affiliation: National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou
authors.affiliation: National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China.
authors.forename: Ming-Hui
authors.initials: MH
authors.lastname: Lu
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Li
authors.initials: L
authors.lastname: Sheng
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Shao-Chun
authors.initials: SC
authors.lastname: Li
authors.affiliation: Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.|Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Jin-Feng
authors.initials: JF
authors.lastname: Jia
authors.affiliation: State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Qi-Kun
authors.initials: QK
authors.lastname: Xue
authors.affiliation: National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Yan-Feng
authors.initials: YF
authors.lastname: Chen
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Ding-Yu
authors.initials: DY
authors.lastname: Xing