Creation of Single-Photon Emitters in WSe2 Monolayers Using Nanometer-Sized Gold Tips

Lintao Peng, Henry Chan, Priscilla Choo, Teri W. Odom, Subramanian K.R.S. Sankaranarayanan, Xuedan Ma

Research output: Contribution to journalArticle

Abstract

Due to their tunable bandgaps and strong spin-valley locking, transition metal dichalcogenides constitute a unique platform for hosting single-photon emitters. Here, we present a versatile approach for creating bright single-photon emitters in WSe2 monolayers by the deposition of gold nanostars. Our molecular dynamics simulations reveal that the formation of the quantum emitters is likely caused by the highly localized strain fields created by the sharp tips of the gold nanostars. The surface plasmon modes supported by the gold nanostars can change the local electromagnetic fields in the vicinity of the quantum emitters, leading to their enhanced emission intensities. Moreover, by correlating the emission energies and intensities of the quantum emitters, we are able to associate them with two types of strain fields and derive the existence of a low-lying dark state in their electronic structures. Our findings are highly relevant for the development and understanding of single-photon emitters in transition metal dichalcogenide materials.

Original languageEnglish
Pages (from-to)5866-5872
Number of pages7
JournalNano letters
Volume20
Issue number8
DOIs
Publication statusPublished - Aug 12 2020

Keywords

  • dark state
  • quantum defects
  • single-photon source
  • strain
  • surface plasmon
  • WSe2 monolayers

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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