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Efficient single band eigenvalue-minimization

A very efficient scheme for the calculation of the lowest eigenvalues, might be obtained
by increasing the basis set mentioned in the previous section in each iteration step,
i.e.:
At the step N solve the eigenvalue problem

with the basis set

The lowest eigenvector of the eigenvalue problem is used
to calculate a new (possibly preconditioned) search vector .

N.B. Requests for support are to be addressed to: vasp.materialphysik@univie.ac.at