Bloch State

[PJ]

HI,
I know that according to Bloch Function, an electron in periodic potential has two parts in its wavefunction. One is the free particle wave function and the another term is the potential due to periodicity.
But I calculated the Bloch state of a Nanoribbon, for bloch index=16, and for k=0, 0.35, 0.5. I am also attaching the screenshot for the same, but I did not understand the result, why it is so.
Please explain me how to read these bloch states and why the plots are like this. Also, if I read the quantum wise ATK VNL manual, it is only given that the top one is conduction band and the bottom one is valance band.

[Nordland]

http://en.wikipedia.org/wiki/Bloch_wave

I am not sure what you dont understand, but what you see the different fourier components for the wave function as described on wiki-pedia.

[PJ]

A very thanks for your reply. The thing that I have not understood is:
How you read these Bloch states plots. I have read Wikipedia. But my question is, what can you predict from these plots. What do the red dots represent? What do the green region represent?
How the plots change by increasing K.