<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Dear All,<br><br>In studying quantum capacitance of doped graphene, I recently made band structure calculations on pristine graphene using supercells of varying sizes. However, I encountered an unexpected result when increasing the supercell size from 2x2x1 to 4x4x1: the linear dispersion behavior around the K - high symmetry point gradually disappeared. This came as a surprise to me since previous articles I read reported a linear dispersion around the K point for similar supercell sizes. I did some also with a gamma Brillouin zone sampling during scf but had same results.<br><br>What are possible reasons behind this and potential approaches to achieve the desired linear behavior in supercell calculations?<br>Are there specific techniques or considerations that need to be taken into account when working with larger supercells of graphene?<br><br>Thank you in advance for your assistance and expertise. <br><br>Regards,<br>David Ansi<br>Master's student<br>University of Sci. and Tech.(KNUST), Ghana<br><br><br data-mce-bogus="1"></div></div></body></html>