Topological, Valleytronic, and Optical Properties of Monolayer PbS.

Wan, Wenhui; Yao, Yugui; Sun, Liangfeng; Liu, Cheng-Cheng; Zhang, Fan · Adv Mater · 2017

basic_science · Level V

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Abstract

A PbS monolayer is demonstrated to be a novel platform for topological, valleytronic, and optical phenomena. Compressive strain can turn the trivial monolayer into a topological insulator. Optical pumping can facilitate charge, spin, and valley Hall effects tunable by external strain and light ellipticity. Similar results apply to other IV-VI semiconductors.