Echoes from anharmonic normal modes in model glasses
- Emory Univ., Atlanta, GA (United States). Dept. of Physics
- Univ. of Chicago, IL (United States). Enrico Fermi Inst.
Glasses display a wide array of nonlinear acoustic phenomena at temperatures T ≲1 K. This behavior has traditionally been explained by an ensemble of weakly coupled, two-level tunneling states, a theory that is also used to describe the thermodynamic properties of glasses at low temperatures. One of the most striking acoustic signatures in this regime is the existence of phonon echoes, a feature that has been associated with two-level systems with the same formalism as spin echoes in NMR. Here we report the existence of a distinctly different type of acoustic echo in classical models of glassy materials. Our simulations consist of finite-ranged, repulsive spheres and also particles with attractive forces using Lennard-Jones interactions. We show that these echoes are due to anharmonic, weakly coupled vibrational modes and perhaps provide an alternative explanation for the phonon echoes observed in glasses at low temperatures.
- Research Organization:
- Univ. of Chicago, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-03ER46088; DMR-1420709; DMR-1455086
- OSTI ID:
- 1418617
- Alternate ID(s):
- OSTI ID: 1244132
- Journal Information:
- Physical Review E, Vol. 93, Issue 3; ISSN 2470-0045
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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journal | January 2020 |
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