Observation of excitonic rydberg states in monolayer MoS2 and WS2 by photoluminescence excitation spectroscopy

Research output: Contribution to journal › Research article › Contributed › peer-review

Contributors

  • Heather M. Hill - , Columbia University (Author)
  • Albert F. Rigosi - , Columbia University (Author)
  • Cyrielle Roquelet - , Columbia University (Author)
  • Alexey Chernikov - , Columbia University (Author)
  • Timothy C. Berkelbach - , Columbia University (Author)
  • David R. Reichman - , Columbia University (Author)
  • Mark S. Hybertsen - , Brookhaven National Laboratory (Author)
  • Louis E. Brus - , Columbia University (Author)
  • Tony F. Heinz - , Columbia University (Author)

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.

Details

Original languageEnglish
Pages (from-to)2992-2997
Number of pages6
JournalNano letters
Volume15
Issue number5
Publication statusPublished - 13 May 2015
Peer-reviewedYes
Externally publishedYes

External IDs

PubMed 25816155

Keywords

ASJC Scopus subject areas

Keywords

  • 2D materials, binding energy, excitons, molybdenum disulfide, Transition metal dichalcogenides, tungsten disulfide