"Science of Nanoscale Systems and Their Device Applications" Nanoscale Science and Engineering Center / Research Nuggets
Focal Point "Cusp" Seen in Electron Imaging Data

Text: On the right we see a focal cusp as determined by ray tracing in a simulation of electron paths in a two degree of freedom electron gas. Darker regions are where more electrons have traveled. On the left is experimental data with an arrow pointing to the focus of a cusp seen in an electron imaging experiment. Quantum fringing is also seen, and a theoretical wave simulation of what that fringing should look like is given in the upper left as a yellow contour map. The match is very good, showing that an accumulation of relative positive charge must exist in the device in the right hand region of the panel, causing the electron focusing.
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Comments: Brief graphic presentations of the research of this Harvard-based research center.