Low-energy modes and Debye behavior in a colloidal crystal

被引：15
|
作者：
Ghosh, Antina [2 ]
Mari, Romain [3 ]
Chikkadi, V. K. [2 ]
Schall, Peter [2 ]
Maggs, A. C.
Bonn, Daniel [1 ,2 ]
机构：
[1] CNRS, UMR 8550, ENS, LPS, F-75005 Paris, France
[2] Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands
[3] ESPCI, CNRS, PMMH UMR7636, F-75005 Paris, France
来源：
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS | 2011年 / 390卷 / 18-19期
关键词：
Colloids; Phonons or vibrational states in low-dimensional structures and nanoscale materials; Lattice dynamics measurements;
D O I：
10.1016/j.physa.2011.02.051
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the vibrational spectrum and the low-energy modes of a three-dimensional colloidal crystal using confocal microscopy. This is done in a two-dimensional cut through a three-dimensional crystal. We find that the observed density of states is incompatible with the standard Debye form in either two or three dimensions. These results are confirmed by numerical simulations. We show that an effective theory for the projections of the modes onto the two-dimensional cut describes the experimental and simulation data in a satisfactory way. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：3061 / 3068
页数：8
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