Physics colloquium is June 8 Leigh Smith, Department of Physics, University of Cincinnati, will present "Imaging Exciton Spins in Single Semiconductor Nanowires" at the physics colloquium at 4 p.m. Friday, June 8, in 211 Witmer Hall. Coffee and cookies will be served at 3:30 p.m. in 215 Witmer Hall. With the development of many new techniques for fabrication or synthesis of novel nanostructures, it has become more important than ever to understand the details of their electronic structure. However, such understanding is severely complicated by the fact that as structures become ever smaller, their surface to volume ratio increases by many orders of magnitude, and so the electronic states are often dominated by structural or surface imperfections. In this talk we discuss novel optical techniques for studying single semiconductor nanowires such as CdS, InP or GaAs/AlGaAs core-shell structures. Through slit-confocal spectroscopy we are able to image single nanowires with spectral, spatial and temporal resolution. These optical techniques allow us to understand the intrinsic electronic states, the nature of surface defects, and the interaction of excitonic spins in single semiconductor nanowires. We will discuss the implications of this research for the development of novel semiconductor nanowire devices For more information contact Juana Moreno at 777-3517 or e-mail juana.moreno@und.nodak.edu . -- Connie Cicha, Administrative Secretary, Physics, connie_cicha@und.nodak.edu, 701-777-2911