Work

Experimental evidence for the ω4 tail of the nonphononic spectra of glasses

Year: 2024

Type: article

Abstract: It is now established that glasses feature low-frequency, nonphononic excitations, in addition to phonons that follow Debye’s vibrational density of state (VDoS). Extensive computer studies demonstrated that these nonphononic, glassy excitations follow a universal non-Debye VDoS DG(ω)∼ω4 at low frequencies ω. Yet, due to intrinsic difficulties in disentangling DG(ω) from the total VDoS D(ω), which is experimentally accessible through various scattering techniques, the ω4 tail of DG(ω) lacked direct experimental support. We develop a procedure to extract DG(ω) from the measured D(ω), based on recent advances in understanding low-frequency excitations in glasses, and apply it to available datasets for diverse glasses. The resulting analysis indicates that the ω4 tail of the nonphononic vibrational spectra of glasses is nontrivially consistent with a broad range of experimental observations. It also further supports that DG(ω) makes an additive contribution to D(ω).

Source: Journal of Applied Physics

DOI: 10.1063/5.0246261

Authors: Avraham Moriel, Edan Lerner, Eran Bouchbinder

Institutions: Princeton University, Institute for Theoretical Physics Amsterdam, University of Amsterdam, Weizmann Institute of Science

Language: English

Topic: Material Dynamics and Properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,500

Funders: James S. McDonnell Foundation, Israel Science Foundation