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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>C</mml:mi><mml:mi>n</mml:mi></mml:msub></mml:math> -symmetric higher-order topological crystalline insulators in atomically thin transition metal dichalcogenides
Based on first-principles calculations and symmetry analysis, we predict atomically thin ($1\ensuremath{-}N$ layers) $2H$ group-VIB transition metal dichalcogenides (TMDs) $M{X}_{2}$ ($M$ = Mo, W; $X$ = S, Se, Te) are large-gap higher-order topological crystalline insulators (HOTCIs) protected by ${C}_{3}$ rotation symmetry. We explicitly demonstrate the nontrivial topological indices and the …