On the Spectral Properties of the Perturbed Landau Hamiltonian
  The Landau Hamiltonian governing the behavior of a quantum particle in dimension 2 in a constant magnetic field is perturbed by a compactly supported magnetic field and a similar electric field. We describe how the spectral subspaces change and how the Landau levels split under this perturbation. 
Grigori Rozenblum (Chalmers University of Technology, Sweden), Grigory   Tashchiyan (St. Petersburg University for Telecommu...