Polarity-dependent dielectric torque in nematic liquid crystals
  The dielectric dispersion in the uniaxial nematic liquid crystals affects the switching dynamics of the director, as the dielectric torque is determined by not only the present values of the electric field and director but also by their past values. We demonstrate that this dielectric memory leads to an unusual contribution to the dielectric torque that is linear in the present field and thus polarity-sensitive. This torque can be used to accelerate the switch-off phase of director dynamics. 
Mingxia Gu, Sergij V. Shiyanovskii and Oleg D. Lavrentovich