Cyclotron Resonance of Wigner Crystals on Liquid Helium
  The cyclotron resonance of the correlated two-dimentional electrons on liquid helium in high magnetic fields is investigated on the basis of the newly developed theory. Electrons are assumed to form a Wigner crystal, and the electron correlation effect is taken into account through the self-consistently determined Wigner phonons, where the electron-electron interaction, the electron-ripplon and electron-vapor atom scatterings are considered on the same footing. The numerical calculations show a very good agreement with experiments without any fitting parameters. 
Van An Dinh and M. Saitoh