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High-Temperature Single-Photon Emission From Covalently Functionalized van der Waals Heterostructures.

S Carin Gavin1, Hsun-Jen Chuang2, Anushka Dasgupta3

  • 1Department of Physics and Astronomy, Northwestern University, Evanston, IL, 60208, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 8, 2025
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Summary

High-purity single-photon emission from tungsten diselenide (WSe2) is now possible at higher temperatures. Molecular functionalization and heterostructure engineering enable quantum applications up to 90 K.

Keywords:
2D materialscovalent functionalizationdefect emissiondiazoniumquantum emittertransition metal dichalcogenidestungsten diselenide

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Area of Science:

  • Materials Science
  • Quantum Optics
  • Nanotechnology

Background:

  • Two-dimensional (2D) transition metal dichalcogenides (TMDs) like tungsten diselenide (WSe2) exhibit single-photon emission (SPE) from atomic defects, crucial for quantum information.
  • Current methods for high-purity SPE in WSe2 are limited to low temperatures (below 30 K), hindering practical applications.

Purpose of the Study:

  • To develop a method for achieving high-purity SPE in WSe2 at elevated temperatures.
  • To enhance the working temperature range of SPE from WSe2 for quantum information applications.

Main Methods:

  • Fabrication of 2D WSe2/graphite heterostructures.
  • Covalent diazonium functionalization of the graphite layer.
  • Characterization of SPE purity and integrity at various temperatures.

Main Results:

  • Achieved high-purity (>90%) SPE in strained WSe2 persisting up to 90 K.
  • Maintained single-photon source integrity up to 115 K using WSe2/graphite heterostructures.
  • Demonstrated a significant increase in the operational temperature range for SPE.

Conclusions:

  • Combining 2D heterostructure engineering with molecular functionalization effectively enhances SPE properties in WSe2.
  • This approach overcomes the low-temperature limitation of WSe2 SPE, opening new avenues for quantum technologies.
  • Surface functionalization and heterostructure design are versatile strategies for improving quantum emission in 2D materials.