Optical detection of a highly localized impurity state in monolayer tungsten disulfide

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


A photoluminescence (PL) peak has been observed from a monolayer of transition metal dichalcogenide (TMD), which is known to be an ideal 2D semiconductor. The PL peak appears near the low-energy side of neutral free excitons with very sharp peak width (∼10 meV) at low temperature (83 K). Systematic temperature-dependent PL measurements reveal that the peak can be explained by bound excitons being trapped by the surface impurities, which results in a highly localized state for the excitons. Since the optically detectable, highly localized impurity state promises to have extensive practical applications for quantum optics, our finding represents an important step in the study of 2D materials for use in quantum computation and information.

Original languageEnglish
Pages (from-to)12777-12785
Number of pages9
JournalACS Nano
Issue number12
Publication statusPublished - 2014 Dec 23


  • bound exciton
  • impurity state
  • photoluminescence
  • transition metal dichalcogenide

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


Dive into the research topics of 'Optical detection of a highly localized impurity state in monolayer tungsten disulfide'. Together they form a unique fingerprint.

Cite this