fix_modify AtC extrinsic electron_integration <integration_type> <num_subcyle_steps(optional)> 
 fix_modify AtC extrinsic electron_integration implicit  
  fix_modify AtC extrinsic electron_integration explicit 100  
Switches between integration scheme for the electron temperature. The number of subcyling steps used to integrate the electron temperature 1 LAMMPS timestep can be manually adjusted to capture fast electron dynamics.
For use only with two_temperature type of AtC fix ( see fix atc command ) 
 
implicit
 subcycle_steps = 1 
 1.6.1
 1.6.1