Vibrational properties of a two-dimensional silica kagome lattice

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Torbjörn Björkman, Viera Skakalova, Simon Kurasch, Ute Kaiser, Jannik C. Meyer, Jurgen H. Smet, Arkady V. Krasheninnikov
Publiceringsår: 2016
Tidskrift: ACS Nano
Volym: 10
Nummer: 12
Artikelns första sida, sidnummer: 10929
Artikelns sista sida, sidnummer: 10935
eISSN: 1936-086X


Abstrakt

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.


Nyckelord

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

Senast uppdaterad 2020-28-02 vid 02:22