""".. _galleryband:

Band-structure
==============


"""

from ase.build import bulk
from ase.calculators.test import FreeElectrons

atoms = bulk('Cu')
band_path = atoms.cell.bandpath('GXWLGK', npoints=200)
atoms.calc = FreeElectrons(nvalence=1, kpts=band_path)
atoms.get_potential_energy()
bs = atoms.calc.band_structure()
bs.plot(emin=0, emax=20, filename='cu.png')