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Efficient<b>k</b>โ <b>p</b>method for the calculation of total energy and electronic density of states
An efficient method for calculating the electronic structure in large systems with a fully converged Brillouin zone sampling is presented. The method is based on a $\mathbf{k}\ensuremath{\cdot}\mathbf{p}$-like approximation developed in the framework of the density-functional perturbation theory. The reliability and efficiency of the method are demonstrated in test calculations on โฆ