Dynamics of two-dimensional dipole systems

Kenneth I. Golden, Gabor J. Kalman, Peter Hartmann, Z. Donkó

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Using a combined analytical/molecular dynamics approach, we study the current fluctuation spectra and longitudinal and transverse collective mode dispersions of the classical two-dimensional (point) dipole system (2DDS) characterized by the φD (r) = μ2 / r3 repulsive interaction potential; μ is the electric dipole strength. The interest in the 2DDS is twofold. First, the quasi-long-range 1/ r3 interaction makes the system a unique classical many-body system, with a remarkable collective mode behavior. Second, the system may be a good model for a closely spaced semiconductor electron-hole bilayer, a system that is in the forefront of current experimental interest. The longitudinal collective excitations, which are of primary interest for the liquid phase, are acoustic at long wavelengths. At higher wave numbers and for sufficiently high coupling strength, we observe the formation of a deep minimum in the dispersion curve preceded by a sharp maximum; this is identical to what has been observed in the dispersion of the zero-temperature bosonic dipole system, which in turn emulates so-called roton-maxon excitation spectrum of the superfluid H4 e. The analysis we present gives an insight into the emergence of this apparently universal structure, governed by strong correlations. We study both the liquid and the crystalline solid state. We also observe the excitation of combination frequencies, resembling the roton-roton, roton-maxon, etc. structures in H4 e.

Original languageEnglish
Article number036402
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume82
Issue number3
DOIs
Publication statusPublished - Sep 7 2010

Fingerprint

rotons
Dipole
dipoles
Excitation
excitation
Liquid
Current Fluctuations
electric dipoles
Dispersion Curves
liquid phases
Superfluid
interactions
molecular dynamics
solid state
Interaction
Molecular Dynamics
acoustics
Semiconductors
Acoustics
Transverse

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Statistics and Probability

Cite this

Dynamics of two-dimensional dipole systems. / Golden, Kenneth I.; Kalman, Gabor J.; Hartmann, Peter; Donkó, Z.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 82, No. 3, 036402, 07.09.2010.

Research output: Contribution to journalArticle

Golden, Kenneth I. ; Kalman, Gabor J. ; Hartmann, Peter ; Donkó, Z. / Dynamics of two-dimensional dipole systems. In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 2010 ; Vol. 82, No. 3.
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