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Proceedings Paper

Generation of coherent charge oscillations in the plane of GaAs quantum wells
Author(s): Shekhar Priyadarshi; Klaus Pierz; Uwe Siegner; Philip Dawson; Mark Bieler
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Paper Abstract

We report on the observation of ultrafast in-plane charge oscillations resulting from simultaneous optical excitation of heavy- and light-hole excitons in (110)-oriented GaAs quantum wells. These charge oscillations arise from a displacement between heavy and light-hole states in the plane of the quantum well, and, thus, differ significantly from previously observed charge oscillations directed along the growth direction of a quantum well. Our observations are evidence for the existence of a strong far-infrared inter-subband transition dipole moment between heavy- and light-hole subbands for in-plane wave vectors which we estimate to be ~0.5 eA for the quantum wells under investigation. We attribute this in-plane transition dipole moment to strong band mixing in the (110)-oriented structures.

Paper Details

Date Published: 20 February 2012
PDF: 11 pages
Proc. SPIE 8260, Ultrafast Phenomena and Nanophotonics XVI, 82600T (20 February 2012); doi: 10.1117/12.905348
Show Author Affiliations
Shekhar Priyadarshi, Physikalisch-Technische Bundesanstalt (Germany)
Klaus Pierz, Physikalisch-Technische Bundesanstalt (Germany)
Uwe Siegner, Physikalisch-Technische Bundesanstalt (Germany)
Philip Dawson, The Univ. of Manchester (United Kingdom)
Mark Bieler, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 8260:
Ultrafast Phenomena and Nanophotonics XVI
Markus Betz; Abdulhakem Y. Elezzabi; Jin-Joo Song; Kong-Thon Tsen, Editor(s)

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