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

TL;DR

This paper investigates the one-particle excitations in a two-dimensional Kondo-lattice, revealing that Q-polaron states dominate the lowest energy band and significantly influence the Fermi surface properties.

Contribution

It introduces a detailed model of elementary excitations including Q-polarons and shows their impact on the band structure in the Kondo-lattice.

Findings

Q-polaron states determine the lowest excitation band in strong coupling.

The band minimum shifts from (pi,pi) to (0,0) due to Q-polarons.

Bare particle spectral weight varies, affecting Fermi surface size.

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.