
1) Condensed matter physics
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https://www.crosswordclues.com/clue/band-diagram

In solid-state physics of semiconductors, a band diagram is a diagram plotting various key electron energy levels (Fermi level and nearby energy band edges) as a function of some spatial dimension, which is often denoted x. These diagrams help to explain the operation of many kinds of semiconductor devices and to visualize band bending. A band dia...
Found on
http://en.wikipedia.org/wiki/Band_diagram
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