Disordered surface vibrations in jammed sphere packings
- Univ. of Pennsylvania, Philadelphia, PA (United States); The University of Chicago
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Univ. of Chicago, IL (United States)
We study the vibrational properties near a free surface of disordered spring networks derived from jammed sphere packings. In bulk systems, without surfaces, it is well understood that such systems ω* frequency is controlled by ΔZ = $$\langle$$Z$$\rangle$$ - 2d, the difference between the average coordination of the spheres and twice the spatial dimension, d, of the system, which vanishes at the jamming transition. In the presence of a free surface we find that there is a density of disordered vibrational modes associated with the surface that extends far below ω . The total number of these low-frequency surface modes is controlled by ΔZ, and the profile of their decay into the bulk has two characteristic length scales, which diverge as ΔZ-1/2 and ΔZ-1 as the jamming transition is approached.
- Research Organization:
- Univ. of Chicago, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- FG02-03ER46088
- OSTI ID:
- 1596345
- Journal Information:
- Soft Matter, Journal Name: Soft Matter Journal Issue: 14 Vol. 11; ISSN SMOABF; ISSN 1744-683X
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Disentangling defects and sound modes in disordered solids
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journal | January 2017 |
| Disentangling defects and sound modes in disordered solids | preprint | January 2015 |
| Topological boundary modes in jammed matter | text | January 2015 |
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