Yoshihisa Yamamoto
Stanford University
A semiconductor laser generates coherent light by the stimulated emission of photons, which requires population inversion in semiconductor active media. An exciton-polariton laser promises an alternative coherent light source based on the bosonic stimulated cooling to the ground state (or dynamical Bose-Einstein condensation), which does not require population inversion. The concept of an exciton-polariton laser has been demonstrated with optical pumping for GaAs, CdTe and GaN. In this talk we will present a first exciton-polariton laser diode with electrical pumping. The threshold carrier density was three orders of magnitude smaller than the critical carrier density required for population inversion. The dynamical condensation property of an exciton-polariton laser opens up a new possibility of this device for quantum simulation and computation.
Friday, March 12, 2010 at 4:00 PM
Room L211, Technological Institute
Refreshments are served at 3:30 PM
