Abstract
We study the effects of mixing of different Landau levels on the energies of one-body states, in the presence of a strong uniform magnetic field and a random potential in two dimensions. We use a perturbative approach and develop a systematic expansion in both the strength and smoothness of the random potential. We find the energies of the extended states shift upward, and the amount of levitation is proportional to $(n+1/2)/{B}^{3}$ for strong magnetic field, where $B$ is the magnetic field strength and $n$ is the Landau level index.
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