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Single-particle spectrum for a model of fermions interacting with two-level local excitations on a lattice: A dynamical CPA approach

The problem of motion of a single electron interacting with a periodic lattice of two-level systems is investigated within a spinless fermion model. The Green's function is calculated in a single-site dynamical coherent potential approximation which is equivalent to DMFT. The picture of one-electron density of states is obtained for various values of the tunnel splitting and coupling between the electron and two-level system. The occurrence of a band splitting with increase of the coupling is demonstrated.

preprint2006arXivOpen access
A. O. AnokhinA. V. ZarubinV. Yu. Irkhin
cond-mat.str-el
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Open access3 authors1 topic
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A. O. AnokhinA. V. ZarubinV. Yu. Irkhin

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