Dear experts,

I am trying to apply negative as well as positive electric field without geometry optimization to mediate the band gap of heterostructures using Castep code implemented in Materials Studio. Below, I attached a figure to illustrate the procedure. Electronic tab >>more>> potentials >> in the electric field, I put "0.15 eV/A" which represents the electric strength, while I change the field direction along Z axis to represents the negative value. Is this correct or I missed something ?

Kind regards,

Mohammed