Dear all, I would like to apply electric field in my CP2K simulations. However, I could not make it work after several tries. My purpose is to apply a uniform E-field in the periodic simulation cell, but I also don't know which option I should apply in my input since the online manual is not so clear. Does someone have the experience of this kind of simulation? Thank you. The following are four options I put into my input file under &DFT section. &EFIELD INTENSITY 0.0001 POLARISATION 0.0 0.0 1.0 ENVELOP CONSTANT &CONSTANT_ENV START_STEP 3 END_STEP 8000 &END CONSTANT_ENV &END EFIELD or &EFIELD INTENSITY 0.0001 POLARISATION 0.0 0.0 1.0 ENVELOP RAMP &RAMP_ENV START_STEP_IN 3 START_STEP_OUT 8000 &END RAMP_ENV &END EFIELD or &EFIELD INTENSITY 0.0001 POLARISATION 0.0 0.0 1.0 ENVELOP GAUSSIAN &GAUSSIAN_ENV T0 0.0 &END GAUSSIAN_ENV &END EFIELD or &PERIODIC_EFIELD INTENSITY 0.0001 POLARISIATION 0.0 0.0 1.0 &END PERIODIC_EFIELD Sincerely, Yun-Wen