Observation of the Boson Peak in a 2D Material

The boson peak is an excess in the phonon density of states relative to the Debye Model, which occurs at frequencies below the Debye limit. It is present in most amorphous materials and, as was recently shown, can sometimes be found also in crystals. Here we present first experimental evidence of th...

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Bibliographic Details
Published inarXiv.org
Main Authors Tømterud, Martin, Eder, Sabrina D, Büchner, Christin, Heyde, Markus, Freund, Hans-Joachim, Simonsen, Ingve, Manson, Joseph R, Holst, Bodil
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 05.05.2022
Subjects
Amorphous materials
Crystals
Helium atoms
Two dimensional materials
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Summary:The boson peak is an excess in the phonon density of states relative to the Debye Model, which occurs at frequencies below the Debye limit. It is present in most amorphous materials and, as was recently shown, can sometimes be found also in crystals. Here we present first experimental evidence of the boson peak in a 2D material, namely 2D silica (SiO\(_2\)). The measurements were obtained by helium atom scattering. A dispersionless boson peak is seen at \(6 \pm 0.5\) meV (1.5\( \pm\) 0.15 THz) and \(-6 \pm 1.5\) meV (\(-1.5 \pm 0.4\) THz), with reasonable evidence for a double excitation at \(\pm 12 \pm 2.5\) meV (\(2.9 \pm 0.6\) THz).
ISSN:2331-8422