November 25,
2009
2:00 p.m.
NOTE TIME CHANGE |
"Oxide
Nanoelectronics," TJeremy Levy, University of
Pittsburgh,
hosted by Matthew Pelton
Abstract: Electronic confinement at nanoscale dimensions
remains a central means of science and technology. In this
talk, I will describe a new method for producing extreme
nanoscale electronic confinement at the interface between
two separately insulating oxides, LaAlO3 and SrTiO3. Using
an approach reminiscent of the popular toy "Etch-a-Sketch," we
scan an electrically biased probe on the surface of this
heterostructure to create nanoscale conducting islands, nanowires,
tunnel junctions, and field-effect transistors at the interface.
The smallest feature size approaches one nanometer. These
structures are created in ambient conditions at room temperature
and can be erased and rewritten repeatedly. At low temperatures,
a variety of quantum phases have been observed, including
integer and fractional quantum Hall states and superconductivity.
This new, on-demand nanoelectronics platform has the potential
for widespread scientific and technological exploitation. |
