Generation of coherent charge oscillations in the plane of GaAs quantum wells

Shekhar Priyadarshi; Klaus Pierz; Uwe Siegner; Philip Dawson; Mark Bieler

doi:10.1117/12.905348

20 February 2012 Generation of coherent charge oscillations in the plane of GaAs quantum wells

Shekhar Priyadarshi, Klaus Pierz, Uwe Siegner, Philip Dawson, Mark Bieler

Proceedings Volume 8260, Ultrafast Phenomena and Nanophotonics XVI; 82600T (2012) https://doi.org/10.1117/12.905348
Event: SPIE OPTO, 2012, San Francisco, California, United States

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.

Citation Download Citation

Shekhar Priyadarshi, Klaus Pierz, Uwe Siegner, Philip Dawson, and Mark Bieler "Generation of coherent charge oscillations in the plane of GaAs quantum wells", Proc. SPIE 8260, Ultrafast Phenomena and Nanophotonics XVI, 82600T (20 February 2012); https://doi.org/10.1117/12.905348

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