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dc.contributor.authorTømterud, Martin
dc.contributor.authorEder, Sabrina Daniela
dc.contributor.authorBüchner, Christin
dc.contributor.authorWondraczek, Lothar
dc.contributor.authorSimonsen, Ingve
dc.contributor.authorSchirmacher, Walter
dc.contributor.authorManson, Joseph R.
dc.contributor.authorHolst, Bodil
dc.date.accessioned2024-03-26T13:05:02Z
dc.date.available2024-03-26T13:05:02Z
dc.date.created2023-09-08T11:20:12Z
dc.date.issued2023
dc.identifier.issn1745-2473
dc.identifier.urihttps://hdl.handle.net/11250/3124250
dc.description.abstractThe boson peak is an excess in the phonon vibrational density of states relative to the Debye model. It has been observed in a wide range of amorphous materials, from inorganic glasses to polymers. Two-dimensional random matrix models and molecular dynamics simulations predict that the boson peak should also be present in amorphous two-dimensional materials, a notion that is of practical importance because it leads to an excess of heat capacity and influences transport properties. However, up until now, experimental observations in actual materials have not been possible due to the limited surface sensitivity of the methods usually applied to measure the boson peak. Here we present the experimental evidence of a boson peak in two-dimensional silica, through phonon spectra measured by means of inelastic helium-atom scattering. We identify the boson peak as a wavenumber-independent spectral maximum at a frequency similar to what has been observed in and predicted for bulk vitreous silica. Furthermore, we present a heterogeneous-elastic theory calculation in two dimensions, which shows how the vibrational coupling of the transversal and flexural shear vertical phonon modes produces the boson peak in two-dimensional materials at a frequency similar to that of the bulk, in agreement with our measurements.en_US
dc.language.isoengen_US
dc.publisherNatureen_US
dc.titleObservation of the boson peak in a two-dimensional materialen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionacceptedVersionen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2
dc.identifier.doi10.1038/s41567-023-02177-2
dc.identifier.cristin2173458
dc.source.journalNature Physicsen_US
dc.source.pagenumber1910-1915en_US
dc.identifier.citationNature Physics. 2023, 19, 1910-1915.en_US
dc.source.volume19en_US


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