Analytic computation of the energy levels of a two-dimensional   hydrogenic donor in a constant magnetic field
  We compute the energy levels of a 2D Hydrogen atom when a constant magnetic field is applied. With the help of a mixed-basis variational method, we calculate the energy eigenvalues of the 1S, 2P- and 3D- levels. We compare the computed energy spectra with those obtained via a generalization of the mesh point technique as well as the shifted 1/N method. We show that the variational solutions present a good behavior in the weak and strong magnetic field regimes. 
Victor M. Villalba and Ramiro Pino (IVIC, Centro de Fisica)