Exciton Dipole Orientation of Strain-Induced Quantum Emitters in WSe2

Yue Luo, Na Liu, Bumho Kim, James Hone, Stefan Strauf

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Transition metal dichalcogenides are promising semiconductors to enable advances in photonics and electronics and have also been considered as a host for quantum emitters. Particularly, recent advances demonstrate site-controlled quantum emitters in WSe2 through strain deformation. Albeit essential for device integration, the dipole orientation of these strain-induced quantum emitters remains unknown. Here we employ angular-resolved spectroscopy to experimentally determine the dipole orientation of strain-induced quantum emitters. It is found that with increasing local strain the quantum emitters in WSe2 undergo a transition from in-plane to out-of-plane dipole orientation if their emission wavelength is longer than 750 nm. In addition, the exciton g-factor remains with average values of g = 8.52 ± 1.2 unchanged in the entire emission wavelength. These findings provide experimental support of the interlayer defect exciton model and highlight the importance of an underlying three-dimensional strain profile of deformed monolayer semiconductors, which is essential to optimize emitter-mode coupling in nanoplasmonics.

Original languageEnglish
Pages (from-to)5119-5126
Number of pages8
JournalNano Letters
Volume20
Issue number7
DOIs
StatePublished - 8 Jul 2020

Keywords

  • 2D materials
  • angular-resolved spectroscopy
  • cavity coupling
  • exciton dipole orientation
  • g-factor
  • quantum emitter

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