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- W1799441917 abstract "Some relevant transport properties of solids do not depend only on the spectrum of the electronic Hamiltonian, but on finer properties preserved only by unitary equivalence, the most striking example being the conductance. When interested in such properties, and aiming to a simpler model, it is mandatory to check that the simpler effective Hamiltonian is approximately unitarily equivalent to the original one, in the appropriate asymptotic regime. In this paper, we consider the Hamiltonian of an electron in a 2-dimensional periodic potential (e.g. generated by the ionic cores of a crystalline solid) under the influence of a uniform transverse magnetic field. We prove that such Hamiltonian is approximately unitarily equivalent to a Hofstadter-like (resp. Harper-like) Hamiltonian, in the limit of weak (resp. strong) magnetic field. The result concerning the case of weak magnetic field holds true in any dimension. Finally, in the limit of strong uniform magnetic field, we show that an additional periodic magnetic potential induces a non-trivial coupling of the Landau bands." @default.
- W1799441917 created "2016-06-24" @default.
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- W1799441917 date "2010-07-27" @default.
- W1799441917 modified "2023-09-27" @default.
- W1799441917 title "Effective models for conductance in magnetic fields: derivation of Harper and Hofstadter models" @default.
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