Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-03-17
Eur. Phys. J. B 52, 315-327 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 15 figures, final version, typo corrections, changes in fig. 6 and fig.9
Scientific paper
10.1140/epjb/e2006-00301-0
The one-dimensional Kondo lattice model is investigated by means of Wegner's flow equation method. The renormalization procedure leads to an effective Hamiltonian which describes a free one-dimensional electron gas and a Heisenberg chain. The localised spins of the effective model are coupled by the well-known RKKY interaction. They are treated within a Schwinger boson mean field theory which permits the calculation of static and dynamic correlation functions. In the regime of small interaction strength static expectation values agree well with the expected Luttinger liquid behaviour. The parameter K_rho of the Luttinger liquid theory is estimated and compared to recent results from density matrix renormalization group studies.
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