Summary of Band structures in 2D
File in which the problem appears
Summary of Band structures in 2D
Problematic sentence
Each band hosts 2N eletrons, therefore a material with odd number of electrons is a metal; that with an even number of electrons may be an insulator.
Correct version
Each band hosts 2N electrons, therefore a material with an odd number of electrons is a metal; that with an even number of electrons may be an insulator.