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Imaging Strain-Localized Single-Photon Emitters in Layered GaSe below the Diffraction Limit.

Weijun Luo1, Benjamin J Lawrie2,3, Alexander A Puretzky2

  • 1Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States.

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|December 4, 2023
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Summary
This summary is machine-generated.

Controlling nanoscale strain in 2D materials enables brighter single photon emitters (SPEs). This study shows strain tuning of GaSe SPEs on nanopillars enhances brightness and wavelength, crucial for quantum photonics.

Keywords:
2D materialscathodoluminescenceexciton funnelinggallium selenidesingle photon emissionstrain engineering

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Area of Science:

  • Materials Science
  • Quantum Optics
  • Nanotechnology

Background:

  • Scalable production of single photon emitters (SPEs) in 2D materials relies on nanoscale strain control.
  • Conventional microscopy is limited by diffraction, hindering detailed analysis of strain localization in SPEs.

Purpose of the Study:

  • To quantify the impact of nanoscale heterogeneous strain on the energy and brightness of Gallium Selenide (GaSe) SPEs.
  • To explore strain-controlled wavelength tunability and brightness enhancement in 2D material SPEs.
  • To investigate exciton funneling mechanisms and radiative biexciton cascade processes.

Main Methods:

  • Correlative cathodoluminescence, photoluminescence, and atomic force microscopy were employed.
  • Density functional theory simulations supported experimental observations.
  • Characterization of GaSe SPEs integrated onto nanopillar structures.

Main Results:

  • Strain-localized GaSe SPEs exhibit emission wavelengths from 620 to 900 nm.
  • A tunable spectral range of approximately 100 nm was achieved through strain engineering.
  • SPE brightness was enhanced by two orders of magnitude at the nanopillar center due to Type-I exciton funneling.
  • Radiative biexciton cascade processes were identified as contributors to photon superbunching.
  • GaSe SPEs demonstrated high stability under electron beam exposure.

Conclusions:

  • Nanoscale strain control offers a powerful method for tuning the properties of 2D material SPEs.
  • Exciton funneling significantly enhances SPE brightness and spectral characteristics.
  • This research provides critical insights for developing deterministic quantum photonics using 2D materials.