Downward relativistic potential step and phenomenological account of   Bohmian trajectories of the Klein paradox
  The Dirac equation has been applied to fermions scattering from the downward potential step. The results show some particles do not fall off the edge of the step and reflect. Also, based on de Broglie-Bohm interpretation of quantum mechanics (Bohmian mechanics) and Bohmian trajectories we have resolved the problem. Lastly, a phenomenological study of the Bohmian trajectory of the Klein paradox has been discussed. 
Mohammad Razavi, Maedeh Mollai, Safa Jami, and Ali Ahanj
quant-ph