CMP Seminar
                  October 15, 2001
               4:10 p.m., Room 224 PA

Charge Accumulation Imaging of 2D Electron Systems
Stuart Tessmer, Michigan State University

Since its development  in 1997, Charge Accumulation Imaging
(CAI) has proven to be a valuable tool to study the behavior of
two-dimensional electron systems.  This cryogenic technique 
locally measures the accumulation of charge below the apex of a 
sharp metal tip, in response to an applied excitation voltage.  
Here at Michigan State, we have implemented a new sample 
configuration that enables us to probe the tunneling signal from 
a parallel 3D electrode into the 2D layer.  Today's talk will 
summarize our progress in probing the physics of the 2D system 
using this scheme.