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PHYSICS AND ASTRONOMY Science at the Edge Friday, January 22, 2010 11:30a 1400 Biomedical & Physical Sciences Bldg Refreshments at 11:15a in 1400 BPS Bldg Steven Cundiff University of Colorado- Boulder "Optical Two-Dimensional Spectroscopy of Semiconductor Nanostructures" Optical two-dimensional Fourier transform spectroscopy of provides detailed information about coupling between optical excitations and relaxation between states. In semiconductors, the low-temperature optical response near the band-gap is dominated by bound electron-hole pairs known as excitons. In semiconductor quantum wells, the polarization dependence of the spectra provides insight into interplay between excitons and biexcitonic states and localization due to disorder. In natural semiconductor quantum dots, the capture of electron-hole pairs from quantum well to quantum dot states can be observed. **local host Prof. Chih-Wei Lai , Dept. Physics and Astronomy ([log in to unmask])***