Experimental evidence for the $ω^4$ tail of the nonphononic spectra of glasses
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866917978253033472 |
|---|---|
| author | Moriel, Avraham Lerner, Edan Bouchbinder, Eran |
| author_facet | Moriel, Avraham Lerner, Edan Bouchbinder, Eran |
| contents | 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 ${\cal D}_{\rm G}(ω)\!\sim\!ω^4$, at low frequencies $ω$. Yet, due to intrinsic difficulties in disentangling ${\cal D}_{\rm G}(ω)$ from the total VDoS ${\cal D}(ω)$, which is experimentally accessible through various scattering techniques, the $ω^4$ tail of ${\cal D}_{\rm G}(ω)$ lacked direct experimental support. We develop a procedure to extract ${\cal D}_{\rm G}(ω)$ from the measured ${\cal D}(ω)$, based on recent advances in understanding low-frequency excitations in glasses, and apply it to available datasets for diverse glasses. The resulting analysis shows that the $ω^4$ tail of the nonphononic vibrational spectra of glasses is nontrivially consistent with a broad range of experimental observations. It also further supports that ${\cal D}_{\rm G}(ω)$ makes an additive contribution to ${\cal D}(ω)$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_16996 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Experimental evidence for the $ω^4$ tail of the nonphononic spectra of glasses Moriel, Avraham Lerner, Edan Bouchbinder, Eran Disordered Systems and Neural Networks Materials Science Soft Condensed Matter 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 ${\cal D}_{\rm G}(ω)\!\sim\!ω^4$, at low frequencies $ω$. Yet, due to intrinsic difficulties in disentangling ${\cal D}_{\rm G}(ω)$ from the total VDoS ${\cal D}(ω)$, which is experimentally accessible through various scattering techniques, the $ω^4$ tail of ${\cal D}_{\rm G}(ω)$ lacked direct experimental support. We develop a procedure to extract ${\cal D}_{\rm G}(ω)$ from the measured ${\cal D}(ω)$, based on recent advances in understanding low-frequency excitations in glasses, and apply it to available datasets for diverse glasses. The resulting analysis shows that the $ω^4$ tail of the nonphononic vibrational spectra of glasses is nontrivially consistent with a broad range of experimental observations. It also further supports that ${\cal D}_{\rm G}(ω)$ makes an additive contribution to ${\cal D}(ω)$. |
| title | Experimental evidence for the $ω^4$ tail of the nonphononic spectra of glasses |
| topic | Disordered Systems and Neural Networks Materials Science Soft Condensed Matter |
| url | https://arxiv.org/abs/2404.16996 |