Quantum spin Hall (QSH) systems are two-dimensional topological insulators with promising device applications due to dissipationless spin currents in their edges. However, most QSH systems realized so far have required cryogenic temperatures due to their small bulk gap sizes. A candidate for a high-temperature QSH material is Bismuthene, i.e., a monolayer of bismuth arranged in a honeycomb lattice on a silicon carbide substrate, which features a semiconducting band structure with an indirect band gap of 0.8 eV.
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