Further testing the validity of generalized heterogeneous-elasticity theory for low-frequency excitations in structural glasses

Walter Schirmacher; Matteo Paoluzzi; Felix Cosmin Mocanu; Dmytro Khomenko; Grzegorz Szamel; Francesco Zamponi; Giancarlo Ruocco

doi:10.1103/96wr-b4l1

arXiv · 2509.04988

Further testing the validity of generalized heterogeneous-elasticity theory for low-frequency excitations in structural glasses

Walter Schirmacher·Matteo Paoluzzi·Felix Cosmin Mocanu·Dmytro Khomenko·Grzegorz Szamel·Francesco Zamponi·Giancarlo Ruocco

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Abstract

We summarize the salient features of our theory of non-phononic vibrational excitations in glasses [W. Schirmacher et al., Nature Comm. 15, 3107 (2024)]. Next, we provide further evidence of the non-universality of the $\omega^4$ scaling of the non-phononic vibrational density of states (DoS), and the existence of an important class of non-phononic excitations in glasses, which we call defect states. These modes are induced by frozen-in stresses and can be classified as quasi-localized. Our results suggest that the commonly observed low-frequency $\omega^4$ scaling of the non-phononic vibrational density of states is highly dependent on technical aspects of the molecular dynamics simulations employed to compute the DoS.

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Walter Schirmacher, Matteo Paoluzzi, Felix Cosmin Mocanu, Dmytro Khomenko, Grzegorz Szamel, Francesco Zamponi, Giancarlo Ruocco. 2025-09-05. Further testing the validity of generalized heterogeneous-elasticity theory for low-frequency excitations in structural glasses. https://doi.org/10.1103/96wr-b4l1

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