[Zurück]

S. Rotter, J. Feist, A. Bäcker, R. Ketzmerick, B. Huckestein, J. Burgdörfer:
"Transport through nano-wires with surface roughness";
Vortrag: Tunneling and Scattering in Complex Systems - From Single to Many Particle Physics, Dresden, Germany; 14.09.2009 - 18.09.2009.

We investigate nano-wires with one-sided surface roughness in the presence of a magnetic field. These scattering systems exhibit a mixed classical phase space which consists of a single regular island embedded in a chaotic sea. In quantum transport through such nano-wires, exponentially diverging localization lengths are found which are due to the tunneling between the regular and the chaotic phase space components. We perform analytical calculations which show that one can associate to each regular island mode a (different) localization length. The corresponding analytical predictions for the transmission fit very well with numerical quantum results performed independently. Our findings also show that the island modes are coupled to one another by an intricate interplay between "chaos assisted tunneling" and "directed chaos", leading to new and interesting transport characteristics.