Weakly bound states in heterogeneous waveguides: a calculation to fourth order

Abstract

We have extended a previous calculation of the energy of a weakly heterogeneous waveguide to fourth order in the density perturbation, deriving its general expression. For particular configurations where the second and third orders both vanish, we discover that the fourth order contribution lowers in general the energy of the state, below the threshold of the continuum. In these cases the waveguide possesses a localized state. We have applied our general formula to a solvable model with vanishing second and third orders reproducing the exact expression for the fourth order.

20 pages, one table, two figures; minor changes with respect to the first version

References in corpus (2)

• Weakly bound states in heterogeneous waveguides
• Perturbation theory for short-range weakly-attractive potentials in one dimension