Low-Frequency Vibrations of Soft Colloidal Glasses

被引：154

作者：

Chen, Ke ^{[1
]}

Ellenbroek, Wouter G. ^{[1
]}

Zhang, Zexin ^{[1
,2
]}

Chen, Daniel T. N. ^{[1
]}

Yunker, Peter J. ^{[1
]}

Henkes, Silke ^{[3
]}

Brito, Carolina ^{[3
,4
]}

Dauchot, Olivier ^{[5
]}

van Saarloos, Wim ^{[3
]}

Liu, Andrea J. ^{[1
]}

Yodh, A. G. ^{[1
]}

机构：

[1] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[2] UPenn, UMI 3254, CNRS Rhodia, Bristol, PA 19007 USA

[3] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands

[4] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil

[5] CEA Saclay, Serv Phys Etat Condense, URA 2464, CNRS, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 02期

关键词：

AMORPHOUS SOLIDS; BOSON PEAK; MODES;

D O I：

10.1103/PhysRevLett.105.025501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We conduct experiments on two-dimensional packings of colloidal thermosensitive hydrogel particles whose packing fraction can be tuned above the jamming transition by varying the temperature. By measuring displacement correlations between particles, we extract the vibrational properties of a corresponding "shadow'' system with the same configuration and interactions, but for which the dynamics of the particles are undamped. The vibrational properties are very similar to those predicted for zero-temperature sphere packings and found in atomic and molecular glasses; there is a boson peak at low frequency that shifts to higher frequency as the system is compressed above the jamming transition.

引用

页数：4

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