Quasi-one-dimensional ballistic ring in crossed high-frequency electric   fields
  We study electron dynamics in a quasi-one-dimensional ballistic ring driven by two crossed high-frequency electric fields parallel to the ring plane. The averaged dipole moment and emission intensity are calculated. The emission polarization coincides with the direction of one of the fields. A possibility is shown of the polarization switching to perpendicular direction under changes in the field amplitudes and frequencies. 
E. M. Epshtein (1), E. G. Fedorov (2), G. M. Shmelev (3) ((1)   Institute of Radio Engineering and Electronics of the Russia...