Superradiant Coupling Effects in Transition-Metal Dichalcogenides

Published on 2018-06-06T19:56:19Z (GMT) by
Optical absorption experiments of the lowest exciton are performed for transition-metal dichalcogenides with different number of atomic layers. We examine two representative materials MoSe2 and WSe2 using incoherent broadband white light. The measured absorption at the A exciton resonance does not saturate for optically thick samples consisting of hundreds of atomic layers and the absorption varies non-monotonously with the layer number. A self-consistent microscopic calculation reproduces the experimental observations, clearly identifying superradiant coupling effects as the origin of this unexpected behavior.

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Stevens, Christopher; Stroucken, Tineke; Stier, Andreas; Paul, jagannath; Zhang, Haoxiang; Dey, Prasenjit; et al. (2018): Superradiant Coupling Effects in Transition-Metal Dichalcogenides. The Optical Society. Collection.