Can I read Probing Exciton Dispersions of Freestanding Monolayer WSe2 by Momentum-Resolved Electron Energy-Loss Spectroscopy on EtoBox?

Probing Exciton Dispersions of Freestanding Monolayer WSe2 by Momentum-Resolved Electron Energy-Loss Spectroscopy by Hong, Jinhua; Senga, Ryosuke; Pichler, Thomas; Suenaga, Kazu is a Physics and Astronomy article available to read on EtoBox.

What is Probing Exciton Dispersions of Freestanding Monolayer WSe2 by Momentum-Resolved Electron Energy-Loss Spectroscopy about?

Excitons, as bound electron-hole paired quasiparticle, play an essential role in the energy transport in the optical-electric properties of semiconductors. Their momentum-energy dispersion relation is a fundamental physical property of great significance to understand exciton dynamics. However, this dispersion is seldom explored especially in two-dimensional transition metal dichalcogenides with rich valleytronic properties. In this work, momentum resolved electron energy-loss spectroscopy was used to measure the dispersions of excitons in freestanding monolayer WSe\_{2}. Besides the parabolically dispersed valley excitons, a subgap dispersive exciton was observed at nonzero momenta for the first time, which can be introduced by the prolific Se vacancies. Our work provides a paradigm to directly probe exciton dispersions in 2D semiconductors and could be generalized to many low-dimensional systems.

Who reads Probing Exciton Dispersions of Freestanding Monolayer WSe2 by Momentum-Resolved Electron Energy-Loss Spectroscopy?

Author

Hong, Jinhua; Senga, Ryosuke; Pichler, Thomas; Suenaga, Kazu

Publisher

The American Physical Society; American Physical Society; American Physical Society (APS) (ISSN 0031-9007)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)