Abstract
We study the non-linear optical properties associated with negatively charged excitons (trions) in II-VI semiconductor quantum wells and single quantum dots. In n-type doped quantum well structures, we observe optical gain and lasing at the trion resonance. The trion momentum distribution spreads out deeper in k-space, while the electrons are closer to the zone center. This results in optical gain at moderate injection levels without inversion in the total number of trions and electrons. The non-linear response of single self-assembled CdSe/ZnSe quantum dots charged with an electron is indeed atom-like. We observe complete bleaching of linear trion absorption spectrum and appearance of induced absorption due to two-pair excitations. The data embody clear signatures for Pauli blocking, few-particle Coulomb correlation, as well as electron-hole exchange finestructure.
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.
