Quantum-confinement-induced periodic surface states in two-dimensional metal-organic frameworks

Zhou，Chun Sheng1,2; Liu，Xiang Rui1; Feng，Yue1; Shao，Xiji1; Zeng，Meng1; Wang，Kedong1; Feng，Min2; Liu，Chang1

2020-11-09

10.1063/5.0026372

APPLIED PHYSICS LETTERS   影响因子和分区

0003-6951

1077-3118

Recently, a series of single-layer metal-organic frameworks (MOFs) was theoretically predicted to be two-dimensional organic topological materials. However, the experimental evidence of their nontrivial topological states has not been found. Here, combining the use of angle-resolved photoemission spectroscopy and scanning tunneling microscopy, we report the electronic structure studies on a single-layer Cu-coordinated 2,4,6-tri(4-pyridyl)-1,3,5-triazine (Cu-T4PT) MOF supported by a Cu(111) substrate and identify periodic surface states with the period of the Cu-T4PT reciprocal lattice. These periodic surface states, which have identical features to the Cu(111) Shockley surface states, can be attributed to the quantum confinement of the surface states of the underlying Cu(111) substrate by the network lattices of the Cu-T4PT MOF. Our work indicates that the surface states of the metal substrate can be tailored in a controlled manner by the network structures of MOFs with different periodic lattices. The lack of intrinsic bands and the possible topological properties of the single-layer Cu-T4PT MOF may be attributed to the strong electronic coupling between the Cu-T4PT MOF and the Cu(111) substrates. In order to exploit organic topological materials predicted in MOFs, it is necessary to grow them on weak van der Waals interaction substrates in the future.

SCI ; EI

英语

NI论文

第一 ; 通讯

National Natural Science Foundation of China (NSFC)[11674149][11622437] ; Guangdong Innovative and Entrepreneurial Research Team Program[2016ZT06D348] ; Shenzhen Key Laboratory[ZDSYS20170303165926217] ; Science, Technology and Innovation Commission of Shenzhen Municipality[KYTDPT20181011104202253] ; National Key R&D Program of China[2017YFA0303500]

Physics

Physics, Applied

WOS:000590841800001

AMER INST PHYSICS

20204709500082

Surface states ; Electronic structure ; Photoelectron spectroscopy ; Organometallics ; Scanning tunneling microscopy ; Van der Waals forces ; Topology

Physical Chemistry:801.4 ; Organic Compounds:804.1 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Classical Physics; Quantum Theory; Relativity:931 ; Atomic and Molecular Physics:931.3 ; High Energy Physics; Nuclear Physics; Plasma Physics:932

PHYSICS

2-s2.0-85096032111

Scopus

1.Shenzhen Institute for Quantum Science and Engineering (SIQSE) and Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
2.School of Physics and Technology and Key Laboratory of Artificial Micro,Nano-Structures of Ministry of Education,Wuhan University,Wuhan,430072,China

Zhou，Chun Sheng,Liu，Xiang Rui,Feng，Yue,et al. Quantum-confinement-induced periodic surface states in two-dimensional metal-organic frameworks[J]. APPLIED PHYSICS LETTERS,2020,117(19).

Zhou，Chun Sheng.,Liu，Xiang Rui.,Feng，Yue.,Shao，Xiji.,Zeng，Meng.,...&Liu，Chang.(2020).Quantum-confinement-induced periodic surface states in two-dimensional metal-organic frameworks.APPLIED PHYSICS LETTERS,117(19).

Zhou，Chun Sheng,et al."Quantum-confinement-induced periodic surface states in two-dimensional metal-organic frameworks".APPLIED PHYSICS LETTERS 117.19(2020).