Condensed Matter Seminar Series
Nanoscale Imaging of Polar and Ferroelectric Materials
Robert Nemanich
Dept.
of Physics, North Carolina State University
www.ssl.physics.ncsu.edu
Thursday March 18, 11:00 am, Room 234, Physics Building
Hosts: Stephen Teitsworth, Glenn Edwards
Abstract: The
polarity properties of wurtzitic III-V nitrides are important for new
heterostructure devices. Similarly, ferroelectric oxide materials such
PZT are considered for electronic and micro-electro-mechanical devices.
Developing approaches to control the properties of surfaces and
interfaces of polarity patterned surfaces may enable these and new
devices which range from high frequency, high power electronics to bio
and chemical sensors. In this seminar, we report approaches to image
these surfaces using scanning probe techniques and electron emission
microscopy with UV free electron laser excitation. Our collaboration
with the Duke FELL has been critical in these studies. We will present
results, which indicate that all of the materials are highly sensitive
to surface and molecular termination. The results allow measurement of
the electronic states and band structure near the surface with
nanometer scale resolution.
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