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Title: Echoes from anharmonic normal modes in model glasses

Journal Article · · Physical Review E
 [1];  [2]
  1. Emory Univ., Atlanta, GA (United States). Dept. of Physics
  2. 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
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (4)

Energy transport in glasses journal January 2020
Memory formation in cyclically deformed amorphous solids and sphere assemblies journal September 2018
Memory formation in cyclically deformed amorphous solids and sphere assemblies preprint January 2018
Memory formation in matter text January 2018

Figures / Tables (11)