The Roton Minimum: Is it a General Feature of Strongly Correlated Liquids?

被引：9

作者：

Kalman, G. J. ^{[2
]}

Kyrkos, S. ^{[1
]}

Golden, K. I. ^{[3
,4
]}

Hartmann, P. ^{[2
,5
]}

Donko, Z. ^{[2
,5
]}

机构：

[1] Le Moyne Coll, Dept Chem & Phys, Syracuse, NY 13214 USA

[2] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[3] Univ Vermont, Dept Math & Stat, Burlington, VT 05405 USA

[4] Univ Vermont, Dept Phys, Burlington, VT 05405 USA

[5] Hungarian Acad Sci, Res Inst Solid State Phys & Opt, H-1525 Budapest, Hungary

来源：

CONTRIBUTIONS TO PLASMA PHYSICS | 2012年 / 52卷 / 03期

基金：

美国国家科学基金会;

关键词：

Strongly coupled liquids; Yukawa liquids; molecular dynamics simulation; roton minimum; INELASTIC SCATTERING; SUPERFLUID-HELIUM; SPECTRUM;

D O I：

10.1002/ctpp.201100095

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The roton minimum is a deep minimum in the collective excitation spectrum of the liquid, forming around fairly high k -values. We have discovered, through MD simulations, that this appears to be a general feature of strongly coupled liquids and is ubiquitous in 2D and 3D Yukawa liquids. We suggest that the physical origin of the roton minimum has to be sought in the quasi-localization of particles in a strongly correlated liquid and in the ensuing formation of local microcrystals whose averaged frequency dispersion would show roton minimum-like feature (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

引用

页码：219 / 223

页数：5

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