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PT of the eigenfunctions and eigenvalues

The FW Hamiltonian has been obtained by means of perturbation theory. In order to get the eigenfunctions and eigenvalues of the FW Hamiltonian in powers of PT has to be applied a second time. We expand the eigenvalue equation of the transformed operator for electrons [Pg.695]

Scalar multiplication from the left with 4 o leads to [Pg.695]

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