Phonons in two-dimensional colloidal crystals with bond-strength disorder

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	Phonons in two-dimensional colloidal crystals with bond-strength disorder
	Gratale, MD ; Yunker, PJ ; Chen, K ; Still, T ; Aptowicz, KB ; Yodh, AG
刊名	PHYSICAL REVIEW E
	2013
卷号	87 期号:5
ISSN号	1539-3755
通讯作者	Gratale, MD (reprint author), Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA.
中文摘要	We study phonon modes in two-dimensional colloidal crystals composed of soft microgel particles with hard polystyrene particle dopants distributed randomly on the triangular lattice. This experimental approach produces close-packed lattices of spheres with random bond strength disorder, i.e., the effective springs coupling nearest neighbors are very stiff, very soft, or of intermediate stiffness. Particle tracking video microscopy and covariance matrix techniques are then employed to derive the phonon modes of the corresponding "shadow" crystals with bond strength disorder as a function of increasing dopant concentration. At low frequencies, hard and soft particles participate equally in the phonon modes, and the samples exhibit Debye-like density of states behavior characteristic of crystals. For mid- and high-frequency phonons, the relative participation of hard versus soft particles in each mode is found to vary systematically with dopant concentration. Additionally, a few localized modes, primarily associated with hard particle motions, are found at the highest frequencies.
资助信息	National Science Foundation [DMR-1206231, PENN MRSEC DMR11-20901, DMR12-05463]; NASA [NNX08AO0G]; DAAD
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57333]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Gratale, MD,Yunker, PJ,Chen, K,et al. Phonons in two-dimensional colloidal crystals with bond-strength disorder[J]. PHYSICAL REVIEW E,2013,87(5).
APA	Gratale, MD,Yunker, PJ,Chen, K,Still, T,Aptowicz, KB,&Yodh, AG.(2013).Phonons in two-dimensional colloidal crystals with bond-strength disorder.PHYSICAL REVIEW E,87(5).
MLA	Gratale, MD,et al."Phonons in two-dimensional colloidal crystals with bond-strength disorder".PHYSICAL REVIEW E 87.5(2013).