title: Topological edge states in a high-temperature superconductor FeSe/SrTiO3(001) film.
abstract: Superconducting and topological states are two most intriguing quantum phenomena in solid materials. The entanglement of these two states, the topological superconducting state, will give rise to even more exotic quantum phenomena. While many materials are found to be either a superconductor or a topological insulator, it is very rare that both states exist in one material. Here, we demonstrate by first-principles theory as well as scanning tunnelling spectroscopy and angle-resolved photoemission spectroscopy experiments that the recently discovered 'two-dimensional (2D) superconductor' of single-layer FeSe also exhibits 1D topological edge states within an energy gap of ∼40 meV at the M point below the Fermi level. It is the first 2D material that supports both superconducting and topological states, offering an exciting opportunity to study 2D topological superconductors through the proximity effect.
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.|State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.|Department of Materials Science and Engineering, University of Utah, Utah 84112, USA.
authors.forename: Z F
authors.initials: ZF
authors.lastname: Wang
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.|Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Huimin
authors.initials: H
authors.lastname: Zhang
authors.affiliation: National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Defa
authors.initials: D
authors.lastname: Liu
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Chong
authors.initials: C
authors.lastname: Liu
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Chenjia
authors.initials: C
authors.lastname: Tang
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Canli
authors.initials: C
authors.lastname: Song
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhong
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.|Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Junping
authors.initials: J
authors.lastname: Peng
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Fangsen
authors.identifier: 0000-0002-9233-0650
authors.initials: F
authors.lastname: Li
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.|Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Caina
authors.initials: C
authors.lastname: Nie
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Lili
authors.identifier: 0000-0002-0788-9725
authors.initials: L
authors.lastname: Wang
authors.affiliation: National Lab for Superconductivity, 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: X J
authors.initials: XJ
authors.lastname: Zhou
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.|Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Xucun
authors.initials: X
authors.lastname: Ma
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Q K
authors.initials: QK
authors.lastname: Xue
authors.affiliation: State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.|Department of Materials Science and Engineering, University of Utah, Utah 84112, USA.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu