One Spin-Polaron Problem in the Two-Dimensional Kondo-Lattice

Details One Spin-Polaron Problem in the Two-Dimensional Kondo-Lattice One Spin-Polaron Problem in the Two-Dimensional Kondo-Lattice

1997-05-26

arxiv.org/abs/cond-mat/9705255v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, revtex, 4 figures, to be published in Phys.Lett.A

Scientific paper

10.1016/S0375-9601(97)00372-1

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.

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