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One Spin-Polaron Problem in the Two-Dimensional Kondo-Lattice | L.A. Maksimov
; A.F.Barabanov
; R.O. Kuzian
; | Date: |
26 May 1997 | Subject: | Strongly Correlated Electrons | cond-mat.str-el | Affiliation: | Kurchatov Institute, Moscow), A.F.Barabanov (Institute for High Pressure Physics, Troitsk), R.O. Kuzian (Institute for Materials Science, Kiev | Abstract: | Within the frameworks of spin-polaron concept and the spherically symmetric state for the antiferromagnetic spin background, the one-particle motion is studied for two-dimensional Kondo-lattice. The elemetary excitations are represented as a Bloch superposition of four one-site electron states: two local states- a bare electron state and a local spin-polaron of small radius, and two states of delocalized polarons which correspond to the coupling of local states to the antiferromagnetic spin wave with momentum Q=(pi,pi), so called Q-polarons. As a remarkable result we show that the lowest band of elementary excitations is essentially determined by Q-polaron states in strongly coupled regime. The account of Q-polarons shifts the band bottom from (pi,pi) to (0,0). The spectral weight of a bare particle in the lowest band states can greatly differ from 1. This may lead to a large Fermi surface for relatively small particle concentration. | Source: | arXiv, cond-mat/9705255 | Services: | Forum | Review | PDF | Favorites |
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