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Proceedings Paper

Ultrafast control of electronic motion in semiconductor nano and mesoscopic structures
Author(s): Alex Matos Abiague; Jamal Berakdar
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Paper Abstract

We study the charge dynamics in a double quantum well and in ballistic mesoscopic rings driven by half-cycle pulses. It is shown that such pulses can be utilized to localize, within femtoseconds, and control, for picoseconds, the electronic motion in a Ga1-xAlxAs based double quantum well. To identify the pulse parameters that appropriate for an efficient control process we developed a simplified analytical model and corroborated the results by performing full numerical calculations. We also show that when a thin ballistic mesoscopic ring is subjected to a linearly polarized HCP a post-pulse (and therefore field-free) polarization is induced in the ring. The non-equilibrium post-pulse polarization oscillates in the ring as long as the coherence is preserved and decays on a time scale determined by the relaxation time.

Paper Details

Date Published: 13 April 2005
PDF: 11 pages
Proc. SPIE 5725, Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX, (13 April 2005); doi: 10.1117/12.582901
Show Author Affiliations
Alex Matos Abiague, Max-Planck-Institut fur Mikrostrukturphysik (Germany)
Jamal Berakdar, Max-Planck-Institut fur Mikrostrukturphysik (Germany)

Published in SPIE Proceedings Vol. 5725:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX
Kong-Thon Tsen; Jin-Joo Song; Hongxing Jiang, Editor(s)

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