A typical metal crystal has quadrillions of electrons wandering around in it. Each one takes up a tiny bit of room in energy-momentum space. Since electrons can give away energy to their environment, they tend to puddle up in the lowest-energy parts of the dispersion relation. The parts below a certain energy threshold fill up with electrons, leaving the parts above the threshold empty.
Click or point at the dispersion relation and use the keys listed below to adjust the energy threshold.
| E |
| D |
Drag the edges of the plot to rotate it.