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Title: Transformation of the Topological Phase and the Edge Modes of Double-Bilayer Bismuthene with Inter-Bilayer Spacing

Abstract

The transformations of the topological phase and the edge modes of a double-bilayer bismuthene were investigated with first-principles calculations and Green’s function as the inter-bilayer spacing increased from 0 Å to 10 Å. At a critical spacing of 2 Å, a topological phase transition from a topological insulator to a band insulator resulting from a band inversion between the highest valence band and the second lowest conduction band, was observed, and this was understood based on the particular orbital characters of the band inversion involved states. The edge modes of double-bilayer bismuthene survived the phase transition. When d was 2 Å < d < 4 Å, the interaction between the edge modes of two separated bismuthene bilayers induced an anti-crossing gap and resulted in a trivial band connection. At and beyond 4 Å, the two bilayers behavior decoupled entirely. The results demonstrate the transformability of the topological phase and the edge modes with the inter-bilayer spacing in double-bilayer bismuthene, which may be useful for spintronic applications.

Authors:
 [1];  [1];  [2];  [1];  [3];  [1]
  1. Nanjing Univ. of Science and Technology, Nanjing (China)
  2. Shandong Univ. of Science and Technology, Qingdao (China)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab.; National Taiwan Univ., Taipei (Taiwan)
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1609843
Grant/Contract Number:  
FG02-07ER46383
Resource Type:
Accepted Manuscript
Journal Name:
Crystals
Additional Journal Information:
Journal Volume: 9; Journal Issue: 5; Journal ID: ISSN 2073-4352
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Crystallography; Materials Science; double-bilayer bismuthene; topological phase transition; edge modes; inter-bilayer spacing; first-principles calculations

Citation Formats

Hu, Huanzhi, Shi, Zhibin, Wang, Peng, Zhou, Weiping, Chiang, Tai-Chang, and Wang, Xiaoxiong. Transformation of the Topological Phase and the Edge Modes of Double-Bilayer Bismuthene with Inter-Bilayer Spacing. United States: N. p., 2019. Web. doi:10.3390/cryst9050266.
Hu, Huanzhi, Shi, Zhibin, Wang, Peng, Zhou, Weiping, Chiang, Tai-Chang, & Wang, Xiaoxiong. Transformation of the Topological Phase and the Edge Modes of Double-Bilayer Bismuthene with Inter-Bilayer Spacing. United States. https://doi.org/10.3390/cryst9050266
Hu, Huanzhi, Shi, Zhibin, Wang, Peng, Zhou, Weiping, Chiang, Tai-Chang, and Wang, Xiaoxiong. Wed . "Transformation of the Topological Phase and the Edge Modes of Double-Bilayer Bismuthene with Inter-Bilayer Spacing". United States. https://doi.org/10.3390/cryst9050266. https://www.osti.gov/servlets/purl/1609843.
@article{osti_1609843,
title = {Transformation of the Topological Phase and the Edge Modes of Double-Bilayer Bismuthene with Inter-Bilayer Spacing},
author = {Hu, Huanzhi and Shi, Zhibin and Wang, Peng and Zhou, Weiping and Chiang, Tai-Chang and Wang, Xiaoxiong},
abstractNote = {The transformations of the topological phase and the edge modes of a double-bilayer bismuthene were investigated with first-principles calculations and Green’s function as the inter-bilayer spacing increased from 0 Å to 10 Å. At a critical spacing of 2 Å, a topological phase transition from a topological insulator to a band insulator resulting from a band inversion between the highest valence band and the second lowest conduction band, was observed, and this was understood based on the particular orbital characters of the band inversion involved states. The edge modes of double-bilayer bismuthene survived the phase transition. When d was 2 Å < d < 4 Å, the interaction between the edge modes of two separated bismuthene bilayers induced an anti-crossing gap and resulted in a trivial band connection. At and beyond 4 Å, the two bilayers behavior decoupled entirely. The results demonstrate the transformability of the topological phase and the edge modes with the inter-bilayer spacing in double-bilayer bismuthene, which may be useful for spintronic applications.},
doi = {10.3390/cryst9050266},
journal = {Crystals},
number = 5,
volume = 9,
place = {United States},
year = {Wed May 22 00:00:00 EDT 2019},
month = {Wed May 22 00:00:00 EDT 2019}
}

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Works referencing / citing this record:

Recent Advances in Novel Topological Materials
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