Echoes from anharmonic normal modes in model glasses.

@article{Burton2016EchoesFA,
  title={Echoes from anharmonic normal modes in model glasses.},
  author={Justin C. Burton and Sidney R. Nagel},
  journal={Physical review. E},
  year={2016},
  volume={93 3},
  pages={
          032905
        }
}
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… 
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