All-optical materials design of chiral edge modes in transition-metal dichalcogenides

抄録

<jats:title>Abstract</jats:title><jats:p>Monolayer transition-metal dichalcogenides are novel materials which at low energies constitute a condensed-matter realization of massive relativistic fermions in two dimensions. Here, we show that this picture breaks for optical pumping—instead, the added complexity of a realistic materials description leads to a new mechanism to optically induce topologically protected chiral edge modes, facilitating optically switchable conduction channels that are insensitive to disorder. In contrast to graphene and previously discussed toy models, the underlying mechanism relies on the intrinsic three-band nature of transition-metal dichalcogenide monolayers near the band edges. Photo-induced band inversions scale linearly in applied pump field and exhibit transitions from one to two chiral edge modes on sweeping from red to blue detuning. We develop an <jats:italic>ab initio</jats:italic> strategy to understand non-equilibrium Floquet–Bloch bands and topological transitions, and illustrate for WS<jats:sub>2</jats:sub> that control of chiral edge modes can be dictated solely from symmetry principles and is not qualitatively sensitive to microscopic materials details.</jats:p>

収録刊行物

被引用文献 (6)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ