Abstract
Using the spin-polaron concept and the spherically symmetric state for the antiferromagnetic spin background, one-particle motion is studied for the two-dimensional Kondo lattice. The elementary excitations are represented by 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 = ( π, π), so-called Q-polarons. We show that the lowest band of elementary excitations is essentially determined by Q-polaron states in the strongly coupled regime. Taking into account Q-polarons shifts the band bottom from (π,π) 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 a relatively small particle concentration.
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