4.8 Article

Flexible atomic buckling and homogeneous edge states in few-layer Bi(110) films

期刊

NANO RESEARCH
卷 15, 期 3, 页码 2374-2381

出版社

TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3735-y

关键词

few-layer Bi(110) films; lattice displacement and inversion; distortion; zigzag edge; edge states

资金

  1. U.S. Air Force Office of Scientific Research Grants [FA9550-15-1-0236, FA9550-20-10068]
  2. T. L. L. Temple Foundation
  3. State of Texas through the Texas Center for Superconductivity at the University of Houston
  4. John J. and Rebecca Moores Endowment

向作者/读者索取更多资源

The local density of states of few-layer Bi(110) films are layer-dependent, transitioning from semiconductor to metallic characteristics as the number of layers increases. The edge states are topographically dependent, affected by reconstructions and distortions between 4-monolayer Bi(110) and graphene. The atomic arrangement in ultrathin Bi(110) films is found to be flexible, with in-plane lattice structures exhibiting displacements and inversions.
The structure and edge states of two-dimensional few-layer Bi(110) films grown on a graphene/SiC substrate were studied by low-temperature scanning tunneling microscopy and spectroscopy. We found that the local density of states of few-layer Bi(110) films are layer-dependent and that the films transition from exhibiting semiconducting characteristics to metallic ones as the number of layers increases. The in-plane lattice structure has numerous displacements and inversions, which implies that the atomic arrangement and atomic buckling in ultrathin Bi(110) films are flexible. The edges formed between 4-monolayer Bi(110) and graphene are reconstructed and distorted, and the corresponding edge states are topographically dependent. Steps from the substrate and domain boundaries also modify the electronic structures and induce additional defect-dependent states, We also found that the zigzag-shaped step edges in few-layer Bi(110) films are nonreconstructed and possess layer-dependent homogeneous edge states, providing a very likely platform for further research on quantum interference of the edge mode in order to confirm the topology in Bi(110).

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