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Prediction of a large-gap and switchable Kane-Mele quantum spin Hall insulator

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Title: Prediction of a large-gap and switchable Kane-Mele quantum spin Hall insulator
Authors: Marrazzo, Antimo, Gibertini, Marco, Campi, Davide, Mounet, Nicolas, Marzari, Nicola
Source: Phys. Rev. Lett. 120, 117701 (2018)
Publication Year: 2017
Collection: Condensed Matter
Subject Terms: Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
More Details: Fundamental research and technological applications of topological insulators are hindered by the rarity of materials exhibiting a robust topologically non-trivial phase, especially in two dimensions. Here, by means of extensive first-principles calculations, we propose a novel quantum spin Hall insulator with a sizeable band gap of $\sim$0.5 eV that is a monolayer of Jacutingaite, a naturally occurring layered mineral first discovered in 2008 in Brazil and recently synthesised. This system realises the paradigmatic Kane-Mele model for quantum spin Hall insulators in a potentially exfoliable two-dimensional monolayer, with helical edge states that are robust and that can be manipulated exploiting a unique strong interplay between spin-orbit coupling, crystal-symmetry breaking and dielectric response.
Document Type: Working Paper
DOI: 10.1103/PhysRevLett.120.117701
Access URL: http://arxiv.org/abs/1712.03873
Accession Number: edsarx.1712.03873
Database: arXiv
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  Data: Prediction of a large-gap and switchable Kane-Mele quantum spin Hall insulator
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  Data: <searchLink fieldCode="AR" term="%22Marrazzo%2C+Antimo%22">Marrazzo, Antimo</searchLink><br /><searchLink fieldCode="AR" term="%22Gibertini%2C+Marco%22">Gibertini, Marco</searchLink><br /><searchLink fieldCode="AR" term="%22Campi%2C+Davide%22">Campi, Davide</searchLink><br /><searchLink fieldCode="AR" term="%22Mounet%2C+Nicolas%22">Mounet, Nicolas</searchLink><br /><searchLink fieldCode="AR" term="%22Marzari%2C+Nicola%22">Marzari, Nicola</searchLink>
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  Data: Phys. Rev. Lett. 120, 117701 (2018)
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  Data: Fundamental research and technological applications of topological insulators are hindered by the rarity of materials exhibiting a robust topologically non-trivial phase, especially in two dimensions. Here, by means of extensive first-principles calculations, we propose a novel quantum spin Hall insulator with a sizeable band gap of $\sim$0.5 eV that is a monolayer of Jacutingaite, a naturally occurring layered mineral first discovered in 2008 in Brazil and recently synthesised. This system realises the paradigmatic Kane-Mele model for quantum spin Hall insulators in a potentially exfoliable two-dimensional monolayer, with helical edge states that are robust and that can be manipulated exploiting a unique strong interplay between spin-orbit coupling, crystal-symmetry breaking and dielectric response.
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