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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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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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Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Fermi Level01:18

Fermi Level

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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
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Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

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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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Valence Bond Theory02:42

Valence Bond Theory

11.7K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Germanium-Vacancy Single Color Centers in Diamond.

Takayuki Iwasaki1, Fumitaka Ishibashi2, Yoshiyuki Miyamoto3

  • 11] Department of Physical Electronics, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan [2] CREST, Japan Science and Technology Agency, Chiyoda, Tokyo.

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Researchers discovered a new germanium-vacancy (GeV) color center in diamond, functioning as a bright single photon source. This defect offers a promising avenue for quantum technologies, with reproducible fabrication methods demonstrated.

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Area of Science:

  • Quantum Information Science
  • Materials Science
  • Solid-State Physics

Background:

  • Atomic-sized fluorescent defects in diamond are crucial for quantum applications.
  • High-intensity, reproducible single photon sources are needed for quantum cryptography and information processing.

Purpose of the Study:

  • To report a novel color center in diamond for single photon emission.
  • To characterize the optical and structural properties of this new defect.

Main Methods:

  • Fabrication of the novel color center using ion implantation and chemical vapor deposition.
  • Optical characterization of photoluminescence and single photon emission.
  • First-principles calculations for atomic structure and energy levels.

Main Results:

  • Discovery of the germanium-vacancy (GeV) color center with a zero-phonon line at 602 nm at room temperature.
  • Demonstration of the GeV center as an efficient single photon source.
  • Successful fabrication via ion implantation and chemical vapor deposition.

Conclusions:

  • The GeV center is a promising new solid-state platform for quantum applications.
  • Reproducible fabrication methods make the GeV center suitable for scalable quantum technologies.
  • Theoretical calculations provide insight into the atomic structure and electronic properties of the GeV center.