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Physical Sciences Seminars at Yorktown Particle Physics at the Crossroad Paul Grannis, SUNY Stonybrook Over the past several decades, particle physics has assembled a Standard Model that seems to fit all known observations. I will describe how we got that model, why we think it is fatally flawed, and the new accelerators and experiments that will lead us to a new paradigm. Date: Friday, October 12 Time: 2:30 – 3:30 pm Location: 20-043 (YKT) DWA 3/07 Contact: David Abraham Phone: 862-2573 Physical Sciences Seminars at Yorktown DWA 3/07 Physical Sciences Seminars at Yorktown Carbon Nanotube Optoelectronics Marcus Freitag Carbon nanotubes are objects with promising properties for nanoscale electronic applications. They also have interesting optical characteristics. Here I will talk about experiments combining optical and electronic measurements on individual nanotubes: spatially-resolved photoconductivity, electroluminescence, and Raman spectroscopy in active devices. In ambipolar transistors we detect a dynamic p-n junction and observe the switching action of individual Schottky barriers. In unipolar transistors we image environmental potential modulations and identify high-field regions where impact excitation occurs. Finally, we have evidence for the existence of excitons in carbon nanotubes and can measure local electrostatic doping through changes in phonon frequencies. Date: Friday, October 19 Time: 2:30 – 3:30 pm Location: 20-043 (YKT) DWA 3/07 Contact: Phaedon Avouris Phone: 862-2722