Low-frequency vibrational density of states of ordinary and ultra-stable glasses

Ding Xu, Shiyun Zhang, Hua Tong, Lijin Wang () and Ning Xu ()
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Ding Xu: University of Science and Technology of China
Shiyun Zhang: University of Science and Technology of China
Hua Tong: University of Science and Technology of China
Lijin Wang: Anhui University
Ning Xu: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract A remarkable feature of disordered solids distinct from crystals is the violation of the Debye scaling law of the low-frequency vibrational density of states. Because the low-frequency vibration is responsible for many properties of solids, it is crucial to elucidate it for disordered solids. Numerous recent studies have suggested power-law scalings of the low-frequency vibrational density of states, but the scaling exponent is currently under intensive debate. Here, by classifying disordered solids into stable and unstable ones, we find two distinct and robust scaling exponents for non-phononic modes at low frequencies. Using the competition of these two scalings, we clarify the variation of the scaling exponent and hence reconcile the debate. Via the study of both ordinary and ultra-stable glasses, our work reveals a comprehensive picture of the low-frequency vibration of disordered solids and sheds light on the low-frequency vibrational features of ultra-stable glasses on approaching the ideal glass.

Date: 2024
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DOI: 10.1038/s41467-024-45671-8

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