Prof. Dr. A. Altland

---

I will discuss the physics of transport phenomena in
driven chaotic environments (`kicked rotors'), as
realized in recent atom optic experiments. The behavior
of these systems depends sensitively on the value of a
scaled Planck constant \tilde h: for irrational values of
\tilde h/(4\pi) they fall into the universality class of
disordered electronic systems and I will discuss the corresponding
localization phenomena. In contrast, for rational values the
rotor-Anderson insulator acquires an infinite conductivity
and turns into a `super-metal'. This implies the existence of a novel
'metal/super-metal' quantum phase transition in cold atom systems.

---

Institut für Theoretische Physik, Universität zu Köln
Seminarraum Theoretische Physik
Contact: not specified