SPEAKER:
Prof. Marjorie Olmstead
Department of Physics
University of Washington

TITLE:
"Structure, Symmetry and Stoichiometry:  Controlling Heteroepitaxy"

ABSTRACT:

Macroscopic properties of layered electronic materials are determined in
large part by atomic-scale interactions during interface formation. In the
interesting case of Ga-Se compounds, we have observed multiple
stoichiometries and crystal structures depending on the choice of
substrate symmetry, lattice mismatch, and growth conditions.  Interface
compounds governing overlayer growth display interesting physics in
their own right, which we have probed with photoelectron spectroscopy and
diffraction.