Effects of stochastic webs on chaotic electron transport in semiconductor superlattices - art. no. 046803

We investigate chaotic electron transport in the lowest miniband of a semic onductor superlattice with a tilted magnetic field. This experimentally acc essible non-Kolmogorov-Arnol'd-Moser system involves only stationary electr ic and magnetic fields, but is dynamically equivalent to a time-dependent k icked harmonic oscillator. The onset of chaos strongly delocalizes the elec tron orbits, thus raising the electrical conductivity. When the cyclotron a nd Bloch frequencies are commensurate, the phase space is threaded by a sto chastic web, which produces a further resonant increase in the conductivity .