Normal modes of a quasi-one-dimensional multi-chain complex plasma

Abstract

We studied equally charged particles, suspended in a complex plasma, which move in a plane and interact with a screened Coulomb potential (Yukawa type) and with an additional external confining parabolic potential in one direction, that makes the system quasi-one-dimensional (Q1D). The normal modes of the system are studied in the presence of dissipation. We also investigated how a perpendicular magnetic field couples the phonon modes with each other. Two different ways of exciting the normal modes are discussed: 1) a uniform excitation of the Q1D lattice, and 2) a local forced excitation of the system in which one particle is driven by e.g. a laser. Our results are in very good agreement with recent experimental findings on a finite single chain system (Phys. Rev. Lett. {\bf 91}, 255003 (2003)). Predictions are made for the normal modes of multi-chain structures in the presence of damping.

15 pages, 14 figures, accepted for publication on PRE

References in corpus (3)

• Generic properties of a quasi-one dimensional classical Wigner crystal
• Phonons and specific heat of linear dense phases of atoms physisorbed in the grooves of carbon nanotube bundles
• Vibrations of a chain of Xe atoms in a groove of carbon nanotube bundle

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