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Title: Visualizing topological edge states of single and double bilayer Bi supported on multibilayer Bi(111) films

Abstract

Freestanding single bilayer Bi(111) is a two-dimensional topological insulator with edge states propagating along its perimeter. Given the interlayer coupling experimentally, the topological nature of Bi(111) thin films and the impact of the supporting substrate on the topmost Bi bilayer are still under debate. Combined with scanning tunneling microscopy and first-principles calculations, we systematically study the electronic properties of Bi(111) thin films grown on a $$\mathrm{NbS}{\mathrm{e}}_{2}$$ substrate. Two types of nonmagnetic edge structures, i.e., a conventional zigzag edge and a 2 x 1 reconstructed edge, coexist alternately at the boundaries of single bilayer islands, the topological edge states of which exhibit remarkably different energy and spatial distributions. Prominent edge states are persistently visualized at the edges of both single and double bilayer Bi islands, regardless of the underlying thickness of Bi(111) thin films. We provide an explanation for the topological origin of the observed edge states that is verified with first-principles calculations. Our paper clarifies the long-standing controversy regarding the topology of Bi(111) thin films and reveals the tunability of topological edge states via edge modifications.

Authors:
 [1];  [1];  [2];  [3];  [4];  [1];  [1]
  1. Huazhong Univ. of Science and Technology, Wuhan (China). School of Physics. Wuhan National High Magnetic Field Center
  2. Stanford Univ., CA (United States). Dept. of Physics; Max Planck Inst. for the Structure and Dynamics of Matter, Hamburg (Germany)
  3. Max Planck Inst. for the Structure and Dynamics of Matter, Hamburg (Germany)
  4. Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Huazhong Univ. of Science and Technology, Wuhan (China); Max Planck Inst. for the Structure and Dynamics of Matter, Hamburg (Germany)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Key Research and Development Program of China; National Natural Science Foundation of China (NNSFC); Fundamental Research Funds for the Central Universities (China); European Research Council (ERC)
OSTI Identifier:
1490396
Alternate Identifier(s):
OSTI ID: 1484558
Grant/Contract Number:  
AC02-76SF00515; 2017YFA0403501; 2016YFA0401003; 2018YFA0307000; 11774105; 11504056; 11522431; 11474112; 2017KFXKJC009; ERC-2015-AdG-694097; 676580; 793609
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; edge states; topological insulators; bilayer films; all-electron density functional calculations; molecular beam epitaxy; scanning tunneling spectroscopy

Citation Formats

Peng, Lang, Xian, Jing-Jing, Tang, Peizhe, Rubio, Angel, Zhang, Shou-Cheng, Zhang, Wenhao, and Fu, Ying-Shuang. Visualizing topological edge states of single and double bilayer Bi supported on multibilayer Bi(111) films. United States: N. p., 2018. Web. doi:10.1103/physrevb.98.245108.
Peng, Lang, Xian, Jing-Jing, Tang, Peizhe, Rubio, Angel, Zhang, Shou-Cheng, Zhang, Wenhao, & Fu, Ying-Shuang. Visualizing topological edge states of single and double bilayer Bi supported on multibilayer Bi(111) films. United States. doi:10.1103/physrevb.98.245108.
Peng, Lang, Xian, Jing-Jing, Tang, Peizhe, Rubio, Angel, Zhang, Shou-Cheng, Zhang, Wenhao, and Fu, Ying-Shuang. Wed . "Visualizing topological edge states of single and double bilayer Bi supported on multibilayer Bi(111) films". United States. doi:10.1103/physrevb.98.245108.
@article{osti_1490396,
title = {Visualizing topological edge states of single and double bilayer Bi supported on multibilayer Bi(111) films},
author = {Peng, Lang and Xian, Jing-Jing and Tang, Peizhe and Rubio, Angel and Zhang, Shou-Cheng and Zhang, Wenhao and Fu, Ying-Shuang},
abstractNote = {Freestanding single bilayer Bi(111) is a two-dimensional topological insulator with edge states propagating along its perimeter. Given the interlayer coupling experimentally, the topological nature of Bi(111) thin films and the impact of the supporting substrate on the topmost Bi bilayer are still under debate. Combined with scanning tunneling microscopy and first-principles calculations, we systematically study the electronic properties of Bi(111) thin films grown on a $\mathrm{NbS}{\mathrm{e}}_{2}$ substrate. Two types of nonmagnetic edge structures, i.e., a conventional zigzag edge and a 2 x 1 reconstructed edge, coexist alternately at the boundaries of single bilayer islands, the topological edge states of which exhibit remarkably different energy and spatial distributions. Prominent edge states are persistently visualized at the edges of both single and double bilayer Bi islands, regardless of the underlying thickness of Bi(111) thin films. We provide an explanation for the topological origin of the observed edge states that is verified with first-principles calculations. Our paper clarifies the long-standing controversy regarding the topology of Bi(111) thin films and reveals the tunability of topological edge states via edge modifications.},
doi = {10.1103/physrevb.98.245108},
journal = {Physical Review B},
number = 24,
volume = 98,
place = {United States},
year = {2018},
month = {12}
}

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