Brillouin-zone sampling in total-energy calculations of aperiodic systems using periodic boundary conditions is considered. Although the energies converge to the exact result in the limit of large supercells for any k-point sampling scheme, they do not converge at the same rate. In particular, it is shown that the use of a single sampling point at the origin of reciprocal space is especially inefficient. A k-point sampling scheme is proposed, which is computationally efficient and its efficacy relative to other common approaches is demonstrated.
|Number of pages||5|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1 Jan 1996|