Coupled dust-lattice modes in complex plasmas.

  title={Coupled dust-lattice modes in complex plasmas.},
  author={V V Yaroshenko and Alexei V. Ivlev and Gregor Morfill},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={71 4 Pt 2},
The coupling between transverse and longitudinal dust-lattice modes due to the particle-wake interactions and vertical dust charge gradient is considered. It is shown that the dust-lattice waves can be subjected to a specific instability, the criterion for which has been derived. This instability can explain experimentally observed spontaneous excitation of vibrational modes in a plasma crystal when the pressure is decreased below a critical value.