Towards Topological Quasi-Freestanding Stanene via Substrate Engineering

Abstract

In search for a new generation of spintronics hardware, material candidates for room temperature quantum spin Hall effect (QSHE) have become a contemporary focus of investigation. Inspired by the original proposal for QSHE in graphene, several heterostructures have been synthesized, aiming at a hexagonal monolayer of heavier group IV elements in order to promote the QSHE bulk gap via increased spin-orbit coupling. So far, however, the monolayer/substrate coupling, which can manifest itself in strain, deformation, and hybridization, has proven to be detrimental to the aspired QSHE conditions for the monolayer. Specifically focusing on stanene, the Sn analogue of graphene, we investigate how an interposing buffer layer mediates between monolayer and substrate in order to optimize the QSHE setting. From a detailed density functional theory study, we highlight the principal mechanisms induced by such a buffer layer to accomplish quasi-free standing stanene in its QSHE phase. We complement our theoretical predictions by presenting the first real attempts to grow a buffer layer on SiC(0001) on which stanene can be deposited.

arXiv comment11 pages, 5 figures

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• Single and bilayer graphene on the topological insulator Bi${}_2$Se${}_3$: Electronic and spin-orbit properties from first principles
• Substrate-supported triplet superconductivity in Dirac semimetals
• Deconfinement of Mott Localized Electrons into Topological and Spin-Orbit Coupled Dirac Fermions
• Decagonal Sn clathrate on $d$-Al-Ni-Co
• Van-Hove tuning of Fermi surface instabilities through compensated metallicity
• Engineering correlated Dirac fermions and flat bands on SiC with transition-metal adatom lattices