Nano-wires with surface disorder: Giant localization lengths and   quantum-to-classical crossover
  We investigate electronic quantum transport through nano-wires with one-sided surface roughness. A magnetic field perpendicular to the scattering region is shown to lead to exponentially diverging localization lengths in the quantum-to-classical crossover regime. This effect can be quantitatively accounted for by tunneling between the regular and the chaotic components of the underlying mixed classical phase space. 
J. Feist, A. B\"acker, R. Ketzmerick, S. Rotter, B. Huckestein, J.   Burgd\"orfer