Section Linear Response::Static Polarization
Use the charge density from the zero-field calculation as the starting density for SCF calculations with applied fields. For small fields, this will be fastest. If there is trouble converging with larger fields, set to false, to initialize the calculation for each field from scratch, as specified by the LCAO variables. Only applies if ResponseMethod = finite_differences.
main/static_pol.F90 : 492
call parse_variable(sys%namespace, 'EMStartDensityIsZeroField', .true., start_density_is_zero_field)