dear Ezad Shojaee, At any q/=0 the perturbation is such that the number of electrons does not change. Even in the limit of q->0 the macroscopic term in the density response is zero (because in a metal the dielectic constant is infinite). Now consider the case of a periodic (q=0) perturbation, the simplest one, a constant, threated with or w/o the FE shift... which of the two treatments corresponds to the result you would obtain in the liimit q->0 ?
please provide your affiliation Stefano de Gironcoli - SISSA and DEMOCRITOS Ezad Shojaee wrote: > Hi > can anyone refer me to some speciefic references about how and > why perodic perturbations(q=0) shift Fermi Energy in metals(in detail)? > Thanx > > ------------------------------------------------------------------------ > Explore the seven wonders of the world Learn more! > <http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=QBRE> > > ------------------------------------------------------------------------ > > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://www.democritos.it/mailman/listinfo/pw_forum >
