title: Vibrational Properties of a Two-Dimensional Silica Kagome Lattice.
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-SiO2structures in Raman spectra and show that, at finite temperatures, the stability of 2D-SiO2lattice is strongly influenced by phonon-phonon interaction. Our results not only provide insights into the vibrational properties of 2D-SiO2and kagome lattices in general but also suggest a quick nondestructive method to detect 2D-SiO2.
authors.affiliation: Physics/Department of Natural Sciences, Åbo Akademi , Turku FI-20500, Finland.|Department of Applied Physics, Aalto University School of Science , P.O. Box 11100, Aalto 00076, Finland.
authors.forename: Torbjörn
authors.identifier: 0000-0002-1154-9846
authors.initials: T
authors.lastname: Björkman
authors.affiliation: Faculty of Physics, University of Vienna , Boltzmanngasse 5, Wien 1190, Austria.|STU Center for Nanodiagnostics , Vazovova 5, Bratislava 81243, Slovakia.
authors.forename: Viera
authors.initials: V
authors.lastname: Skakalova
authors.affiliation: Electron Microscopy Group of Materials Science, University of Ulm , Ulm 89081, Germany.
authors.forename: Simon
authors.initials: S
authors.lastname: Kurasch
authors.affiliation: Electron Microscopy Group of Materials Science, University of Ulm , Ulm 89081, Germany.
authors.forename: Ute
authors.initials: U
authors.lastname: Kaiser
authors.affiliation: Faculty of Physics, University of Vienna , Boltzmanngasse 5, Wien 1190, Austria.
authors.forename: Jannik C
authors.initials: JC
authors.lastname: Meyer
authors.affiliation: Max Planck Institute for Solid State Research , Stuttgart 70569, Germany.
authors.forename: Jurgen H
authors.initials: JH
authors.lastname: Smet
authors.affiliation: Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf , Dresden 01328, Germany.|Department of Applied Physics, Aalto University School of Science , P.O. Box 11100, Aalto 00076, Finland.
authors.forename: Arkady V
authors.initials: AV
authors.lastname: Krasheninnikov
keywords: 2D materials; 2D silicon dioxide; Raman spectroscopy; anharmonicity; density functional theory; kagome