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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Defect-Induced Single-Photon Emission in ZnPS3.

Natalia Zawadzka1, Dmitrii Litvinov2,3, Stan Kwast4

  • 1University of Warsaw, Faculty of Physics, Pasteura 5, 02-093 Warsaw, Poland.

ACS Nano
|June 16, 2026
PubMed
Summary
This summary is machine-generated.

Researchers discovered single photon emission in zinc phosphorus sulfide (ZnPS3), a novel layered material. This finding expands the search for quantum emitters beyond transition metal dichalcogenides and hexagonal boron nitride, identifying phosphorus vacancies as the likely source.

Keywords:
Raman scattering spectroscopylayered materialsphotoluminescence spectroscopysingle photon emissiontransition metal thiophosphates

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Area of Science:

  • Quantum optics and condensed matter physics.
  • Exploration of novel quantum emitter platforms in layered materials.

Background:

  • Current single photon sources in layered materials are primarily limited to transition metal dichalcogenides (TMDs) and hexagonal boron nitride (hBN).
  • These materials offer distinct semiconducting and insulating properties, facilitating integration into van der Waals heterostructures and devices.
  • There is a need to explore new material classes for quantum emitters with potentially enhanced properties.

Purpose of the Study:

  • To report and characterize single photon emission in zinc phosphorus sulfide (ZnPS3), a member of the MPX3 family.
  • To elucidate the underlying mechanisms responsible for single photon emission in ZnPS3.
  • To investigate the potential of MPX3 materials as platforms for quantum emitters.

Main Methods:

  • Comprehensive characterization of vibrational and optical properties using polarization-resolved Raman scattering and low-temperature photoluminescence spectroscopy.
  • Second-order correlation measurements to confirm the quantum nature of the emission.
  • Ab initio density functional theory and GW many-body perturbation theory calculations to analyze bulk and defect-related electronic structure.

Main Results:

  • Stable and narrow optical transitions localized at defect sites were observed in ZnPS3, confirming single photon emission.
  • Raman scattering revealed key phonon modes and strong metal-ligand interactions influencing phonon dynamics and defect-bound excitonic states.
  • Theoretical calculations identified phosphorus vacancies as the likely origin of these midgap states and observed optical transitions.

Conclusions:

  • Phosphorus vacancies in ZnPS3 are identified as the origin of single photon emitters.
  • ZnPS3 represents a new class of layered materials for hosting quantum emitters, offering stronger electronic correlations than TMDs or hBN.
  • The findings suggest potential for exploring other MPX3 compounds for defect-based quantum emitters with tunable magnetic properties.