a "sawlike" potential is not homegeneous! as simple as that ... the first is implemented as a regular potential, the second using Berry's phases and constrained optimization, following ideas from Resta, Vanderbilt, Umari-Pasquarello among others
Cheers - SB On Jul 8, 2008, at 11:19 AM, alan chen wrote: > Dear PWSCF users, > I know this question might be too general but I just want to > give a try. > In PWSCF, there are two options for external field. One is > 'tefield' to simulate a sawlike potential, the other is 'lelfield' > to simulate a homogeneous electric field. Could you tell the > difference between these two options? Or can you link me to some > useful references about how to use these two types of external field? > Thank you very much. > > Hanghui > Department of Physics, > Yale University > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://www.democritos.it/mailman/listinfo/pw_forum --- Stefano Baroni - SISSA & DEMOCRITOS National Simulation Center - Trieste http://www.sissa.it/~baroni / [+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype) La morale est une logique de l'action comme la logique est une morale de la pens?e - Jean Piaget Please, if possible, don't send me MS Word or PowerPoint attachments Why? See: http://www.gnu.org/philosophy/no-word-attachments.html -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20080708/ab6c7b4b/attachment.htm
