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What can be learnt from pinching a glass
| Content Provider | Semantic Scholar |
|---|---|
| Author | Rainone, Corrado Bouchbinder, Eran Lerner, Edan |
| Copyright Year | 2019 |
| Abstract | It is now well established that glasses feature quasilocalized nonphononic excitations, which follow a universal $\omega^4$ density of states in the limit of low frequencies $\omega$. All glass-specific properties, such as the dependence on the preparation protocol or composition, are encapsulated in the non-universal prefactor of the universal $\omega^4$ law. The prefactor, however, is a composite quantity that incorporates information both about the number of quasilocalized nonphononic excitations and their characteristic stiffness, in an apparently inseparable manner. We show that by pinching a glass, i.e. by probing its response to force dipoles, one can disentangle and independently extract the two fundamental pieces of physical information. This analysis reveals that the number of quasilocalized nonphononic excitations follows a Boltzmann-like distribution in terms of the parent temperature from which the glass is quenched. The latter, sometimes termed the fictive (or effective) temperature, plays important roles in non-equilibrium thermodynamic approaches to the relaxation, flow and deformation of glasses. The analysis also shows that the characteristic stiffness of quasilocalized nonphononic excitations can be related to their characteristic size, a long sought-for length scale. These results show that important physical information, which is relevant for various key questions in glass physics, can be obtained through pinching a glass. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://export.arxiv.org/pdf/1911.07744 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
