Mistake in Picture

What is wrong with this picture as shown in the backbone?

Well, let's look at the correct version:

In k-space the only possible states for electrons and holes are right on the dispersion curve. An electron just somewhere as in the wrong picture, would have a combination of energy E and k-vector (or, same thing, momentum) that simply does not exist.

Of course, by drawing it 100 % correctly, there would be so many things at the same point (e.g. tip/end of arrows, symbol for hole, dispersion curve) that the drawing becomes hard to "read".

With frame

2.2.3 Life Time and Diffusion Length

Band-Bending and Surface Charge

Solution to 3.1.1