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We would like to comment that the prediction of Half-mtallicity in only Bedge H-passivated zigzag boron nitride nanoribbons (ZBNNR-BH), by Zheng etal.1, is not correct as their interpretation is erroneous. Since it is wellknown that for a material, to be a half-metal, as a primary condition one typeof spin channels or bands (either spin up or spin down) are conducting and theopposite ones are insulating. In commented article 1, ZBNNR-BH shows insulatingbehavior for spin up bands (Eg=4.5 eV) whereas conducting nature for spin downelectrons. They claim1 through the electronic band structure of 8-ZBNNR-BH [asshown in figure 2 (b)]1, that spin down - Alpha (conduction band minimum - CBM)and Beta (valence band maximum - VBM) bands are crossing each other at theFermi level (green dotted line) and thus the ribbons are conducting for spindown electrons. But this crossing of two same spin bands is impossible becauseaccording to well-known Paulis exclusion principle- Two identical fermions(particles with half-integer spin) cannot occupy the same quantum statesimultaneously.In the case of electrons, it is impossible for two electrons ofa poly-electron atom to have the same values of the four quantum numbers (n, l,ml and ms). Thus for two electrons residing in the same orbital (same energylevel e.g. above stated crossing point 1), n, l, and ml are the same, so msmust be different and the electrons must have opposite spins.

Comment on Half metallicity along the edge of zigzag boron nitride nanoribbons (Phys. Rev. B 78, 205415 (2008)