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Title: Prediction of two-dimensional topological insulator by forming a surface alloy on Au/Si(111) substrate

Abstract

Two-dimensional (2D) topological insulators (TIs), which can be integrated into the modern silicon industry, are highly desirable for spintronics applications. Here, using first-principles electronic structure calculations, we show that the Au/Si(111)- 3 substrate can provide a platform for hosting 2D TIs obtained through the formation of surface alloys with a honeycomb pattern of adsorbed atoms. We systematically examined elements from groups III to VI of the periodic table at 2/3 monolayer coverage on Au/Si(111)- 3 , and found that In, Tl, Ge, and Sn adsorbates result in topologically nontrivial phases with band gaps varying from 0 to 50 meV. Our scanning tunneling microscopy and low-energy electron diffraction experiments confirm the presence of the honeycomb pattern when Bi atoms are deposited on Au/Si(111)- 3 , in accord with our theoretical predictions. Our findings pave the way for using surface alloys as a potential route for obtaining viable 2D TI platforms.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. National Sun Yat-Sen Univ., Kaohsiung (Taiwan)
  2. National Dong Hwa Univ., Hualien (Taiwan)
  3. National Univ. of Singapore (Singapore)
  4. Northeastern Univ., Boston, MA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for the Computational Design of Functional Layered Materials (CCDM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Ministry of Science and Technology of Taiwan (MOST); Singapore National Research Foundation (NRF)
OSTI Identifier:
1387716
Alternate Identifier(s):
OSTI ID: 1235631
Grant/Contract Number:  
SC0012575; MOST-104-2112-M110- 002-MY3; MOST-101-2218-E-110-003-MY3; MOST-102-2112-M-110-006-MY2; MOST-104-2112-M-110-011; FG02-07ER46352; AC02-05CH11231; NRF-NRFF2013-03
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 3; Related Information: CCDM partners with Temple University (lead); Brookhaven National Laboratory; Drexel University; Duke University; North Carolina State University; Northeastern University; Princeton University; Rice University; University of Pennsylvania; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; catalysis (heterogeneous); solar (photovoltaic); energy storage (including batteries and capacitors); hydrogen and fuel cells; defects; mechanical behavior; materials and chemistry by design; synthesis (novel materials)

Citation Formats

Chuang, Feng-Chuan, Hsu, Chia-Hsiu, Chou, Hsin-Lei, Crisostomo, Christian P., Huang, Zhi-Quan, Wu, Shih-Yu, Kuo, Chien-Cheng, Yeh, Wang-Chi V., Lin, Hsin, and Bansil, Arun. Prediction of two-dimensional topological insulator by forming a surface alloy on Au/Si(111) substrate. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.035429.
Chuang, Feng-Chuan, Hsu, Chia-Hsiu, Chou, Hsin-Lei, Crisostomo, Christian P., Huang, Zhi-Quan, Wu, Shih-Yu, Kuo, Chien-Cheng, Yeh, Wang-Chi V., Lin, Hsin, & Bansil, Arun. Prediction of two-dimensional topological insulator by forming a surface alloy on Au/Si(111) substrate. United States. doi:10.1103/PhysRevB.93.035429.
Chuang, Feng-Chuan, Hsu, Chia-Hsiu, Chou, Hsin-Lei, Crisostomo, Christian P., Huang, Zhi-Quan, Wu, Shih-Yu, Kuo, Chien-Cheng, Yeh, Wang-Chi V., Lin, Hsin, and Bansil, Arun. Tue . "Prediction of two-dimensional topological insulator by forming a surface alloy on Au/Si(111) substrate". United States. doi:10.1103/PhysRevB.93.035429. https://www.osti.gov/servlets/purl/1387716.
@article{osti_1387716,
title = {Prediction of two-dimensional topological insulator by forming a surface alloy on Au/Si(111) substrate},
author = {Chuang, Feng-Chuan and Hsu, Chia-Hsiu and Chou, Hsin-Lei and Crisostomo, Christian P. and Huang, Zhi-Quan and Wu, Shih-Yu and Kuo, Chien-Cheng and Yeh, Wang-Chi V. and Lin, Hsin and Bansil, Arun},
abstractNote = {Two-dimensional (2D) topological insulators (TIs), which can be integrated into the modern silicon industry, are highly desirable for spintronics applications. Here, using first-principles electronic structure calculations, we show that the Au/Si(111)-3 substrate can provide a platform for hosting 2D TIs obtained through the formation of surface alloys with a honeycomb pattern of adsorbed atoms. We systematically examined elements from groups III to VI of the periodic table at 2/3 monolayer coverage on Au/Si(111)-3, and found that In, Tl, Ge, and Sn adsorbates result in topologically nontrivial phases with band gaps varying from 0 to 50 meV. Our scanning tunneling microscopy and low-energy electron diffraction experiments confirm the presence of the honeycomb pattern when Bi atoms are deposited on Au/Si(111)-3, in accord with our theoretical predictions. Our findings pave the way for using surface alloys as a potential route for obtaining viable 2D TI platforms.},
doi = {10.1103/PhysRevB.93.035429},
journal = {Physical Review B},
issn = {2469-9950},
number = 3,
volume = 93,
place = {United States},
year = {2016},
month = {1}
}

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