| Autor: |
Wang L; School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China., Szamel G; Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA., Flenner E; Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA. |
| Jazyk: |
angličtina |
| Zdroj: |
The Journal of chemical physics [J Chem Phys] 2023 Mar 28; Vol. 158 (12), pp. 126101. |
| DOI: |
10.1063/5.0139596 |
| Abstrakt: |
Low-frequency vibrational harmonic modes of glasses are frequently used to rationalize their universal low-temperature properties. One well studied feature is the excess low-frequency density of states over the Debye model prediction. Here, we examine the system size dependence of the density of states for two-dimensional glasses. For systems of fewer than 100 particles, the density of states scales with the system size as if all the modes were plane-wave-like. However, for systems greater than 100 particles, we find a different system-size scaling of the cumulative density of states below the first transverse sound mode frequency, which can be derived from the assumption that these modes are quasi-localized. Moreover, for systems greater than 100 particles, we find that the cumulative density of states scales with the frequency as a power law with the exponent that leads to the exponent β = 3.5 for the density of states. For systems whose sizes were investigated, we do not see a size-dependence of exponent β. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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