%0 Journal Article %T Exotic atoms in two dimensions %A Combescure Monique %A Fayard Claude %A Khare Avinash %A Richard Jean-Marc %J Physics %D 2010 %I arXiv %X 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 $ \delta{E}= A_0^2/\ln (a/R)$, where $a$ is the scattering length in the short-range potential, $A_0^2/(2\,\pi)$ 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. %U http://arxiv.org/abs/1006.5506v2