Chemomechanical modification of quantum emission in monolayer WSe2

M. Iqbal Bakti Utama, Hongfei Zeng, Tumpa Sadhukhan, Anushka Dasgupta, S. Carin Gavin, Riddhi Ananth, Dmitry Lebedev, Wei Wang, Jia Shiang Chen, Kenji Watanabe, Takashi Taniguchi, Tobin J. Marks, Xuedan Ma, Emily A. Weiss, George C. Schatz*, Nathaniel P. Stern*, Mark C. Hersam*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Two-dimensional (2D) materials have attracted attention for quantum information science due to their ability to host single-photon emitters (SPEs). Although the properties of atomically thin materials are highly sensitive to surface modification, chemical functionalization remains unexplored in the design and control of 2D material SPEs. Here, we report a chemomechanical approach to modify SPEs in monolayer WSe2 through the synergistic combination of localized mechanical strain and noncovalent surface functionalization with aryl diazonium chemistry. Following the deposition of an aryl oligomer adlayer, the spectrally complex defect-related emission of strained monolayer WSe2 is simplified into spectrally isolated SPEs with high single-photon purity. Density functional theory calculations reveal energetic alignment between WSe2 defect states and adsorbed aryl oligomer energy levels, thus providing insight into the observed chemomechanically modified quantum emission. By revealing conditions under which chemical functionalization tunes SPEs, this work broadens the parameter space for controlling quantum emission in 2D materials.

Original languageEnglish (US)
Article number2193
JournalNature communications
Volume14
Issue number1
DOIs
StatePublished - Dec 2023

ASJC Scopus subject areas

  • General Physics and Astronomy
  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology

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