We investigate the properties of the low-frequency spectrum in the density of states D(ω) of a 3D model glass former. To magnify the non-Debye sector of the spectrum, we introduce a random pinning field that freezes a finite particle fraction to break the translational invariance and shifts all of the vibrational frequencies of the extended modes toward higher frequencies. We show that non-Debye soft localized modes progressively emerge as the fraction p of pinned particles increases. Moreover, the low-frequency tail of D(ω) goes to zero as a power law ωδ(p), with 2 ≤ δ(p) ≤ 4 and δ = 4 above a threshold fraction pth.

Probing the non-Debye low-frequency excitations in glasses through random pinning / Angelani, Luca; Paoluzzi, Matteo; Parisi, Giorgio; Ruocco, Giancarlo. - In: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA. - ISSN 0027-8424. - 115:35(2018), pp. 8700-8704. [10.1073/pnas.1805024115]

Probing the non-Debye low-frequency excitations in glasses through random pinning

Angelani, Luca;Paoluzzi, Matteo;Parisi, Giorgio;Ruocco, Giancarlo
2018

Abstract

We investigate the properties of the low-frequency spectrum in the density of states D(ω) of a 3D model glass former. To magnify the non-Debye sector of the spectrum, we introduce a random pinning field that freezes a finite particle fraction to break the translational invariance and shifts all of the vibrational frequencies of the extended modes toward higher frequencies. We show that non-Debye soft localized modes progressively emerge as the fraction p of pinned particles increases. Moreover, the low-frequency tail of D(ω) goes to zero as a power law ωδ(p), with 2 ≤ δ(p) ≤ 4 and δ = 4 above a threshold fraction pth.
2018
Energy spectrum; Glasses; Inherent structures; Low temperature; Non-Debye law; Multidisciplinary
01 Pubblicazione su rivista::01a Articolo in rivista
Probing the non-Debye low-frequency excitations in glasses through random pinning / Angelani, Luca; Paoluzzi, Matteo; Parisi, Giorgio; Ruocco, Giancarlo. - In: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA. - ISSN 0027-8424. - 115:35(2018), pp. 8700-8704. [10.1073/pnas.1805024115]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1209652
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