4.6 Article

Localized electronic and vibrational states in amorphous diamond

Journal

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 23, Issue 8, Pages 4835-4840

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp06393b

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Funding

  1. U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
  2. U.S. DOE [DE-AC02-07CH11358]
  3. National Natural Science Foundation of China [21773132]

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The amorphous diamond structures generated through simulations exhibit high tetrahedral bonding, approaching the compressibility and band gap of crystalline diamond, with some sp(2) bonding defects and local strains contributing to localized electronic states and vibrational modes.
Amorphous diamond structures are generated by quenching high-density high-temperature liquid carbon using tight-binding molecular-dynamics simulations. We show that the generated amorphous diamond structures are predominated by strong tetrahedral bonds with the sp(3) bonding fraction as high as 97%, thus exhibit an ultra-high incompressibility and a wide band gap close to those of crystalline diamond. A small amount of sp(2) bonding defects in the amorphous sample contributes to localized electronic states in the band gap while large local strain gives rise to localization of vibrational modes at both high and low frequency regimes.

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