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Disordered surface vibrations in jammed sphere packings

Journal Article · · Soft Matter
DOI:https://doi.org/10.1039/c4sm02905d· OSTI ID:1596345
 [1];  [2];  [2];  [3]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States); The University of Chicago
  2. Univ. of Pennsylvania, Philadelphia, PA (United States)
  3. 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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Cited By (5)

Spatial structure of states of self stress in jammed systems journal January 2016
Topological boundary modes in jammed matter journal January 2016
Disentangling defects and sound modes in disordered solids 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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