Intervalley exciton (IMAGE)

University of California - Riverside

Intervalley exciton

Caption

Image shows intervalley exciton light emission from monolayer WSe2. Monolayer WSe2 consists of a two-dimensional array of tungsten atoms (cyan balls) and selenium atoms (yellow balls). Its conduction and valence energy bands exhibit two valleys with opposite electron spins (red and blue cups). An electron (green ball) and a hole (purple ball) in the opposite valleys can be bound to form an intervalley exciton (orange-yellow ellipsoid), which decays to emit light with circular polarization (red spiral).

Credit

Erfu Liu, UC Riverside.

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