Searching for Large-gap Quantum Spin Hall Insulators: Boron-Nitride/(Pb, Sn)/{\alpha}-Al2O3 Sandwich Structures

Topological insulators hold great potential for efficient information processing and storage. Using density functional theory calculations, we predict that a honeycomb lead monolayer can be stabilized on the Al2O3 (0001) substrate and becomes topologically non-trivial with a sizeable band gap (~0.27...

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Bibliographic Details
Published in:arXiv.org 2017-01
Main Authors: Wang, Hui, D Lu, Kim, J, Wang, Z, Pi, S T, Wu, R Q
Format: Article
Language:English
Subjects:
Aluminum oxide
Boron nitride
Data processing
Density functional theory
Honeycomb construction
Lead
Monolayers
Sandwich structures
Substrates
Tin
Topological insulators
Topology
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Summary:Topological insulators hold great potential for efficient information processing and storage. Using density functional theory calculations, we predict that a honeycomb lead monolayer can be stabilized on the Al2O3 (0001) substrate and becomes topologically non-trivial with a sizeable band gap (~0.27 eV). Furthermore, we propose to use hexagonal boron-nitride (h-BN) monolayer as a protection for the topological states of Pb/Al2O3 and Sn/Al2O3. Our findings suggest new possibilities for designing and protecting two-dimensional TIs for practical applications.
ISSN:2331-8422
DOI:10.48550/arxiv.1701.07523