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  • Title: Observation of Excitonic Rydberg States in Monolayer MoS2 and WS2 by Photoluminescence Excitation Spectroscopy.
    Author: Hill HM, Rigosi AF, Roquelet C, Chernikov A, Berkelbach TC, Reichman DR, Hybertsen MS, Brus LE, Heinz TF.
    Journal: Nano Lett; 2015 May 13; 15(5):2992-7. PubMed ID: 25816155.
    Abstract:
    We have identified excited exciton states in monolayers of MoS2 and WS2 supported on fused silica by means of photoluminescence excitation spectroscopy. In monolayer WS2, the positions of the excited A exciton states imply an exciton binding energy of 0.32 eV. In monolayer MoS2, excited exciton transitions are observed at energies of 2.24 and 2.34 eV. Assigning these states to the B exciton Rydberg series yields an exciton binding energy of 0.44 eV.
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