Exotic atoms in two dimensions∗

We study the behavior of energy levels in two dimensions for exotic atoms, i.e., when a long-range attractive potential is supplemented by a short-range interaction, and compare the results with these of the one- and three-dimensional cases. The energy shifts are well reproduced by a scattering length formula δE = A20 / ln(a/R), where a is the scattering length in the short-range potential, A20/(2pi) the square of the wave function at the origin in the external potential, and R is related to the derivative with respect to the energy of the solution that is regular at large distances.