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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