Higher Harmonics Generation in Strongly Coupled Magnetized   Two-Dimensional Yukawa Liquids
  The excitation spectra of two-dimensional strongly coupled (liquid-like) Yukawa systems under the influence of a magnetic field perpendicular to the plane are found to sustain additional high-frequency modes at multiples of the magnetoplasmon. These modes are reminiscent of the well-known Bernstein modes but show a number of important differences due to the strong coupling of the particles. 
T. Ott, M. Bonitz, Z. Donk\'o, H. K\"ahlert and P. Hartmann
physics.plasm-ph