Volume 69, Number 2, January 2005
|Page(s)||277 - 283|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||15 December 2004|
Ultrafast build-up of polarization in mesoscopic rings
Max-Planck Institut für Mikrostrukturphysik - Weinberg 2, 06120 Halle, Germany
Accepted: 15 November 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.
PACS: 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
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