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.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call