Further testing the validity of generalized heterogeneous-elasticity theory for low-frequency excitations in structural glasses
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917485568065536 |
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| author | Schirmacher, Walter Paoluzzi, Matteo Mocanu, Felix Cosmin Khomenko, Dmytro Szamel, Grzegorz Zamponi, Francesco Ruocco, Giancarlo |
| author_facet | Schirmacher, Walter Paoluzzi, Matteo Mocanu, Felix Cosmin Khomenko, Dmytro Szamel, Grzegorz Zamponi, Francesco Ruocco, Giancarlo |
| contents | 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 $ω^4$ 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 $ω^4$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_04988 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Further testing the validity of generalized heterogeneous-elasticity theory for low-frequency excitations in structural glasses Schirmacher, Walter Paoluzzi, Matteo Mocanu, Felix Cosmin Khomenko, Dmytro Szamel, Grzegorz Zamponi, Francesco Ruocco, Giancarlo Disordered Systems and Neural Networks 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 $ω^4$ 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 $ω^4$ 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. |
| title | Further testing the validity of generalized heterogeneous-elasticity theory for low-frequency excitations in structural glasses |
| topic | Disordered Systems and Neural Networks |
| url | https://arxiv.org/abs/2509.04988 |