SEARCH Articles Figures Tables Density functional theory empirical tight-binding Density functional theory tight-binding Density functional tight binding DFTB) Density functional tight-binding technique Density functional-based tight binding Density functional-based tight-binding method Density-functional tight-binding DFTB) method Density-functional tight-binding function comparison Density-functional tight-binding method Electronic structure computations density functional tight-binding Self-consistent charge density functional tight-binding method Self-consistent charge density-functional tight-binding Self-consistent charged-density functional tight binding Tight-binding Tight-binding density-functional theory -based