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Title: Robust Large Gap Two-Dimensional Topological Insulators in Hydrogenated III–V Buckled Honeycombs

Journal Article · · Nano Letters
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. National Sun Yat-sen Univ. (Taiwan)
  2. National Univ. of Singapore (Singapore)
  3. Univ. of The Philippines Los Baños, Laguna, (Philippines)
  4. Northeastern Univ., Boston, MA (United States)

A large gap two-dimensional (2D) topological insulator (TI), also known as a quantum spin Hall (QSH) insulator, is highly desirable for low-power-consuming electronic devices owing to its spin-polarized backscattering-free edge conducting channels. Although many freestanding films have been predicted to harbor the QSH phase, band topology of a film can be modified substantially when it is placed or grown on a substrate, making the materials realization of a 2D TI challenging. In this work we report a first-principles study of possible QSH phases in 75 binary combinations of group III (B, Al, Ga, In, and Tl) and group V (N, P, As, Sb, and Bi) elements in the 2D buckled honeycomb structure, including hydrogenation on one or both sides of the films to simulate substrate effects. A total of six compounds (GaBi, InBi, TlBi, TlAs, TlSb, and TlN) are identified to be nontrivial in unhydrogenated case; whereas for hydrogenated case, only four (GaBi, InBi, TlBi, and TlSb) remains nontrivial. The band gap is found to be as large as 855 meV for the hydrogenated TlBi film, making this class of III–V materials suitable for room temperature applications. TlBi remains topologically nontrivial with a large band gap at various hydrogen coverages, suggesting the robustness of its band topology against bonding effects of substrates.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for the Computational Design of Functional Layered Materials (CCDM)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012575; FG02-07ER46352; AC02-05CH11231
OSTI ID:
1371091
Journal Information:
Nano Letters, Vol. 15, Issue 10; 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; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 93 works
Citation information provided by
Web of Science

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Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets journal July 2019
Controlling the Polarity of the Molecular Beam Epitaxy Grown In-Bi Atomic Film on the Si(111) Surface journal January 2019
Predicting two-dimensional topological phases in Janus materials by substitutional doping in transition metal dichalcogenide monolayers journal September 2019
Prediction of topological property in TlPBr 2 monolayer with appreciable Rashba effect journal January 2018
Topologically nontrivial phase and tunable Rashba effect in half-oxidized bismuthene journal January 2019
Oxygen-functionalized TlTe buckled honeycomb from first-principles study journal January 2019
Prediction of high-temperature Chern insulator with half-metallic edge states in asymmetry-functionalized stanene journal January 2018
Structural and electronic properties of hydrogenated GaBi and InBi honeycomb monolayers with point defects journal January 2018
Thickness of elemental and binary single atomic monolayers journal January 2020
Robust large gap quantum spin Hall insulators in methyl and ethynyl functionalized TlSb buckled honeycombs journal July 2018
Prediction of two-dimensional organic topological insulator in metal-DCB lattices journal December 2018
Magnetotransport and superconductivity in InBi films grown on Si(111) by molecular beam epitaxy journal September 2019
2D O-PTl monolayer: a robust large bandgap topological insulator journal October 2019
Electronic properties of the two-dimensional (Tl, Rb)/Si(1 1 1)$\boldsymbol{\sqrt3 \times \sqrt3}$ compound having a honeycomb-like structure journal September 2018
Topological phase transition and tunable electronic properties of hydrogenated bismuthene: from single-layer to double-layer journal October 2019
High throughput screening for two-dimensional topological insulators journal September 2018
Prediction of two-dimensional topological insulator by forming a surface alloy on Au/Si(111) substrate journal January 2016
Robust dual topological character with spin-valley polarization in a monolayer of the Dirac semimetal Na 3 Bi journal February 2017
The Fluorescent Quenching Mechanism of N and S Co-Doped Graphene Quantum Dots with Fe3+ and Hg2+ Ions and Their Application as a Novel Fluorescent Sensor journal May 2019
Is It Possible To Prepare and Stabilize Triple-Bonded Thallium≡Antimony Molecules Using Substituents? journal August 2018
Quantum spin Hall phase in 2D trigonal lattice journal September 2016
Strain induced band inversion and topological phase transition in methyl-decorated stanene film journal December 2017
Prediction of Quantum Anomalous Hall Insulator in half-fluorinated GaBi Honeycomb journal August 2016
Large gap Quantum Spin Hall Insulators of Hexagonal III-Bi monolayer journal October 2016
Robust Room-Temperature Quantum Spin Hall Effect in Methyl-functionalized InBi honeycomb film text January 2016
Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets text January 2018