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Sci Rep. 2015 Mar 18;5:9218. doi: 10.1038/srep09218.

Exciton binding energy of monolayer WS₂.

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Physics Department, University of Hong Kong, Hong Kong, China.


The optical properties of monolayer transition metal dichalcogenides (TMDC) feature prominent excitonic natures. Here we report an experimental approach to measuring the exciton binding energy of monolayer WS₂ with linear differential transmission spectroscopy and two-photon photoluminescence excitation spectroscopy (TP-PLE). TP-PLE measurements show the exciton binding energy of 0.71 ± 0.01 eV around K valley in the Brillouin zone.

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