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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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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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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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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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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Atomic-Scale Engineering and Strain Modulation of Quantum Defects in Hexagonal Boron Nitride.

Tianhao Yang1, Pengru Huang2,3, Zhizhan Qiu4

  • 1Department of Chemistry, National University of Singapore, Singapore 117543, Singapore.

ACS Nano
|March 26, 2026
PubMed
Summary

Researchers engineered atomic defects in hexagonal boron nitride (hBN) for quantum applications. They precisely controlled defects and their properties using advanced microscopy, paving the way for improved quantum emitters and spin qubits.

Keywords:
2D insulatorsdiscrete midgap stateshexagonal boron nitridesingle defectsstrain engineering

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Area of Science:

  • Materials Science
  • Quantum Information Science
  • Condensed Matter Physics

Background:

  • Atomic defects in hexagonal boron nitride (hBN) are crucial for solid-state quantum emitters and spin qubits.
  • A deterministic structure-property relationship at the atomic scale for these defects is currently lacking.
  • This limits the full potential of hBN-based quantum technologies.

Purpose of the Study:

  • To develop a method for atomic-scale engineering and characterization of quantum defects in hBN.
  • To establish a link between defect structure and their quantum properties.
  • To enable precise control over defect properties for quantum applications.

Main Methods:

  • Utilized scanning tunneling microscopy/spectroscopy (STM/STS) and noncontact atomic force microscopy with a CO-functionalized tip.
  • Employed controlled argon ion bombardment to create specific boron (VB) and nitrogen (VN) vacancies in hBN.
  • Formed nanobubbles by encapsulating Ar to decouple defects from the substrate for electronic state probing.

Main Results:

  • Successfully created and identified VB and VN defects in hBN.
  • Observed distinct in-gap electronic states with phonon replicas for on-bubble VN defects.
  • Demonstrated that nanobubble size tuning modulates strain, which in turn tunes the energy of defect electronic states, confirmed by DFT calculations.

Conclusions:

  • Developed a strategy for atomic-level engineering and deciphering of quantum defects in hBN.
  • Established a method for controlling quantum defect properties through local strain engineering.
  • Provided fundamental insights into intrinsic defect structures and their manipulation for quantum information science.