Polarization Control of Deterministic Single-Photon Emitters in Monolayer WSe2

Jae-Pil So, Kwang-Yong Jeong, Jung Min Lee, Kyoung-Ho Kim, Soon-Jae Lee, Woong Huh, Ha-Reem Kim, Jae-Hyuck Choi, Jin Myung Kim, Yoon Seok Kim, Chul-Ho Lee, SungWoo Nam, Hong-Gyu Park

Research output: Contribution to journalArticlepeer-review


Single-photon emitters, the basic building blocks of quantum communication and information, have been developed using atomically thin transition metal dichalcogenides (TMDCs). Although the bandgap of TMDCs was spatially engineered in artificially created defects for single-photon emitters, it remains a challenge to precisely align the emitter's dipole moment to optical cavities for the Purcell enhancement. Here, we demonstrate position- and polarization-controlled single-photon emitters in monolayer WSe2. A tensile strain of ∼0.2% was applied to monolayer WSe2 by placing it onto a dielectric rod structure with a nanosized gap. Excitons were localized in the nanogap sites, resulting in the generation of linearly polarized single-photon emission with a g(2) of ∼0.1 at 4 K. Additionally, we measured the abrupt change in polarization of single photons with respect to the nanogap size. Our robust spatial and polarization control of emission provides an efficient way to demonstrate deterministic and scalable single-photon sources by integrating with nanocavities.

Original languageEnglish (US)
Pages (from-to)1546-1554
Number of pages9
JournalNano letters
Issue number3
StatePublished - Feb 10 2021


  • cavity-coupled emitter
  • polarization control
  • single-photon emitter
  • TMDC

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Bioengineering
  • General Chemistry
  • General Materials Science


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