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We carry out the direct minimization of the energy functional proposed byMauri, Galli and Car to derive the correct self-consistent ground state withfractional occupation numbers for a system degenerating at the Fermi level. Asa consequence, this approach enables us to determine the electronic structureof metallic systems to a high degree of accuracy without the aid of levelbroadening of the Fermi-distribution function. The efficiency of the method isillustrated by calculating the ground-state energy of C$_2$ and Si$_2$molecules and the W(110) surface to which a tungsten adatom is adsorbed.Comment: 4 pages, 4 figure

Direct minimization to generate electronic states with proper occupation numbers