Confinement-deconfinement transitions for two-dimensional Dirac   particles
  We consider a two-dimensional massless Dirac operator coupled to a magnetic field $B$ and an electric potential $V$ growing at infinity. We find a characterization of the spectrum of the resulting operator $H$ in terms of the relation between $B$ and $V$ at infinity. In particular, we give a sharp condition for the discreteness of the spectrum of $H$ beyond which we find dense pure point spectrum. 
Josef Mehringer and Edgardo Stockmeyer
math-ph math.MP