Dear siesta user I got graphene phonon dispersion with vibra. without kgrid_Monkhorst_Pack(%block), means with just single k-point (gamma) and superr cell 2*2*0 got to a accurate graphene dispersion.
I think that it's not true physically but result is correct. my question is : Could a single k-point along the gamma direction be enough to describe phonon dispersion? Best Drogar -- with the best wishes...
