Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 49, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/49/5/055305
Keywords
quantum spin Hall effect; arsenene; band inversion; first-principles calculations
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Funding
- National Natural Science Foundation of China [11274143, 61172028, 11304121]
- Research Fund for the Doctoral Program of University of Jinan [XBS1433]
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The search for a new quantum spin Hall (QSH) phase and effective manipulation of its edge states are very important for both fundamental sciences and practical applications. Here, we use first-principles calculations to study the strain-driven topological phase transition of two-dimensional (2D) arsenene monolayer. We find that the band gap of arsenene decreases with increasing strain and changes from indirect to direct, and then the s-p band inversion takes place at the. point as the tensile strain is larger than 11.14%, which leads to a nontrivially topological state. A single pair of topologically protected helical edge states is established for the edge of arsenene, and their QSH states are confirmed with the nontrivial topological invariant Z(2) = 1. We also propose high-dielectric BN as an ideal substrate for the experimental synthesis of arsenene, maintaining its nontrivial topology. These findings provide a promising candidate platform for topological phenomena and new quantum devices operating at nanoelectronics.
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