Polarization of wave modes in a two-dimensional hexagonal lattice using a complex (dusty) plasma.
Wave spectra corresponding to the random particle motion in a monolayer Yukawa crystal were studied for various directions of propagation. It was found that there are two wave modes with a polarization alternating between the longitudinal and transverse. In the long-wavelength regime, the modes became purely longitudinal and transverse as was known before. In the short-wavelength regime the spectra strongly depended on the wavelength and the direction of propagation. The results obtained from the experiment, theory, and simulation agreed well with each other.
Zhdanov
S
S
CIPS, Max-Planck-Institut für Extraterrestrische Physik, D-85740 Garching, Germany.
Nunomura
S
S
Samsonov
D
D
Morfill
G
G