Original Paper

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

  1. G.J. Kalman1,
  2. S. Kyrkos2,*,
  3. K.I. Golden3,
  4. P. Hartmann1,4,
  5. Z. Donko1,4

Article first published online: 12 APR 2012

DOI: 10.1002/ctpp.201100095

Issue

Contributions to Plasma Physics

Contributions to Plasma Physics

Volume 52, Issue 3, pages 219–223, April 2012

Additional Information

How to Cite

Kalman, G.J., Kyrkos, S., Golden, K.I., Hartmann, P. and Donko, Z. (2012), The Roton Minimum: Is it a General Feature of Strongly Correlated Liquids?. Contrib. Plasma Phys., 52: 219–223. doi: 10.1002/ctpp.201100095

Author Information

  1. 1

    Department of Physics, Boston College, Chestnut Hill, MA 02467, USA

  2. 2

    Department of Chemistry & Physics, Le Moyne College, Syracuse, NY 13214, USA

  3. 3

    Dept. of Mathematics & Statistics & Dept. of Physics, University of Vermont, Burlington, VT 05405, USA

  4. 4

    Research Institute for Solid State Physics & Optics, Hungarian Academy of Sciences, P.O. Box 49, H-1525, Budapest, Hungary

*Department of Chemistry & Physics, Le Moyne College, Syracuse, NY 13214, USA

Publication History

  1. Issue published online: 12 APR 2012
  2. Article first published online: 12 APR 2012
  3. Manuscript Accepted: 13 FEB 2012
  4. Manuscript Revised: 26 JAN 2012
  5. Manuscript Received: 18 OCT 2011

Funded by

  • NSF grants PHY-0813153, PHY-0715227, PHY-1105005, PHY-0812956, and PHY-0903808
  • OTKA grants K-77653 and PD-75113

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Keywords:

  • Strongly coupled liquids;
  • Yukawa liquids;
  • molecular dynamics simulation;
  • roton minimum

Abstract

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 (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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