Vibrational properties of a two-dimensional silica kagome lattice

Torbjörn Björkman, Viera Skakalova, Simon Kurasch, Ute Kaiser, Jannik C. Meyer, Jurgen H. Smet, Arkady V. Krasheninnikov

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10 Citations (Scopus)

Abstract

Kagome lattices are structures possessing fascinating magnetic and vibrational properties, but in spite of a large body of theoretical work, experimental realizations and investigations of their dynamics are scarce. Using a combination of Raman spectroscopy and density functional theory calculations, we study the vibrational properties of two-dimensional silica (2D-SiO2), which has a kagome lattice structure. We identify the signatures of crystalline and amorphous 2D-SiO2 structures in Raman spectra and show that, at finite temperatures, the stability of 2D-SiO2 lattice is strongly influenced by phonon–phonon interaction. Our results not only provide insights into the vibrational properties of 2D-SiO2 and kagome lattices in general but also suggest a quick nondestructive method to detect 2D-SiO2.
Original languageUndefined/Unknown
Pages (from-to)10929–10935
JournalACS Nano
Volume10
Issue number12
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • 2D materials
  • silicon/silicon dioxide
  • anharmonicity
  • Raman spectroscopy
  • Density functional theory

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