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We present results from calculations of the electronical band structures of graphene and zigzag graphene nanoribbons employing the sX‐LDA approximation to the electron–electron interaction. The sX‐LDA functional includes non‐local electron exchange and is thus expected to yield more accurate results than standard LDA or GGA functionals. We show that sX‐LDA can make up for the shortcomings of LDA in...
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