Abstract
Coherent and incoherent transport processes of charge carriers in an InGaAsP/InGaAsP superlattice embedded in a p-i-n diode are investigated by time-resolved differential electroabsorption spectroscopy. The initial stages of the current evolution in the first picosecond after excitation with a femtosecond optical pump pulse are resolved. Coherent current oscillations within the superlattice layer are observed with a frequency depending on the electric field applied to the superlattice. These current oscillations are due to Bloch oscillations performed by excited carriers. We compare contributions of electroabsorption and excitonic bleaching to the time-resolved signal. A strong influence of incoherent carrier dynamics such as sub-picosecond field screening and carrier sweep-out on the dephasing and frequency of Bloch oscillations is observed.
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
