Abstract
We have investigated terahertz (THz) emission due to miniband transport of electrons in biased GaAs/AlGaAs superlattice diodes by time-resolved THz spectroscopy. Quasi-autocorrelation measurements were performed on the emitted THz electromagnetic wave using a bolometer as a wideband detector. We found that the THz emission due to miniband transport is strongly dependent on the photon energy of the pump laser pulses. A clear oscillation in the THz autocorrelation signal due to Bloch oscillation has been observed by exciting the sample at a photon energy slightly lower than the center of the Wannier-Stark ladder even for a superlattice with a miniband width larger than the longitudinal optical (LO) phonon energy. Furthermore, transient velocities of electrons in the miniband have been estimated from the measured THz autocorrelation signal.
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.
