Hi.<br>I use pp.x to get the difference of the charge densities.<br>I tested it for a unit cell of a Si, with and without an additional electron (hole), and it works properly.<br>However, it does not work for the supercells of Si/SiO2 with and without one additional electron. It keeps giving me "incompatible celldm" error; the supercell dimensions are identical, though.<br>
I was wondering how possibly I could solve the problem.<br>Thanks for your help.<br>p Shok<br>