Volume 135, Number 6, September 2021
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||30 December 2021|
Density of quasi-localized modes in athermal glasses
1 Department of Chemical Physics, The Weizmann Institute of Science - Rehovot 76100, Israel
2 Center for OPTical IMagery Analysis and Learning, Northwestern Polytechnical University - Xi'an, 710072, China
3 McKetta Department of Chemical Engineering, University of Texas at Austin - Austin, TX 78712, USA
Received: 11 July 2021
Accepted: 17 September 2021
A careful examination of the Quasi-Localized Modes (QLMs) that exist in a generic atomistic model of a glass former reveals at least two types of them, each exhibiting a different density of states, one depending on the frequency as and the other as . The properties of the glassy energy landscape that is responsible for the two types of modes is examined here, explaining the analytic feature responsible for the creations of (at least) two families of QLMs. It is argued that the QLMs that are revealed by diagonalizing the Hessian matrix are not related to possibly existing Two-Level Systems (TLS).
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