Dear Suman, It is not SIESTA who decide if there are boundary conditions or not. It is your specific problem: a periodic system or not.
I think that if your system IS a nanodisk, then, there aren't boundary conditions so your system can be considered as a single "molecule" and there aren't bands. To use SIESTA, you have to setup your input using "fake boundary conditions", I mean, you put your nanodisk in a box, big enough to avoid inter-disk interactions. []'s, @mps On Fri, Feb 7, 2014 at 1:19 PM, Suman Chowdhury <[email protected]>wrote: > Dear all, > How do I calculate the electronic structure of graphene nano disks which > do not have any boundary condition by siesta? > > -- > > > > *Junior research fellow Dept. of Physics, University of Calcutta Kolkata- > 700009, West Bengal, India.* > * Ph no-+91-9830512232 <%2B91-9830512232>* > >
