Ultrafast build-up of polarization in mesoscopic ringsA. Matos-Abiague and J. Berakdar
Max-Planck Institut für Mikrostrukturphysik - Weinberg 2, 06120 Halle, Germany
received 14 September 2004; accepted in final form 15 November 2004
published online 15 December 2004
Subjecting a non-interacting mesoscopic ring (MR) to a linearly polarized half-cycle electromagnetic pulse results in a non-uniform, non-equilibrium coherent population of electronic states. A post-pulse charge polarization of the ring is then created within few picoseconds and sustains for times determined by the relaxation time scale. These conclusions are the results of a theoretical analysis of the electronic quantum dynamics of a MR subjected to unipolar pulses. Methods to trace experimentally the charge polarization build-up are suggested.
78.67.-n - Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures.
73.23.-b - Electronic transport in mesoscopic systems.
73.23.Ad - Ballistic transport.
© EDP Sciences 2005