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Journal Article
Valleytronics: Stark control
2017
Overview
By exploiting the optical Stark effect, the valley degree of freedom in monolayer transition metal dichalcogenides can be selectively manipulated and detected using all-optical methods. Encoding information in quantum degrees of freedom is at the heart of quantum electronics. Valley pseudospin, which labels local energy extrema in the band structure of certain periodic solids,has been proposed and pursued as an alternative information carrier, closely resembling electron spin. Although valley polarization can be generated and detected using optical techniques in materials such as monolayer transition metal dichalcogenides, manipulation of this degree of freedomis challenging. Writing in Nature Physics, Ziliang Ye and co-workers1 demonstrate an ultrafast, all-optical method for manipulating the valley pseudospin of excitons in a monolayer of tungsten diselenide (WSe2).
Publisher
Nature Publishing Group
Subject
