I just learned something about the quantum hall effect, and was wondering about the spin splitting at a filling factor of 5 and 7, i.e. I have nearly equal sized plateaus for the filling factor of 2, 3 and 4, but I have only a small plateau at 5, and no plateau at 7. I asked my teacher, but he could not give me an explanation for this, he only could tell me that is has something to do with spin splitting. So, why do I get these "small" plateaus, and why is there a spin splitting?
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