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Spin polaron in the Kondo lattice model
Publication - PRB 79, 235107 (2009)
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We study the spectral properties of the one-dimensional Kondo lattice model
as a function of the exchange coupling, the band filling, and the
quasimomentum in the ferromagnetic and paramagnetic phases. Using the
density-matrix renormalization group method, we compute the dispersion
relation of the quasiparticles, their lifetimes, and the Z factor.
Sigrist et al. [Phys. Rev. Lett. 67, 2211 (1991)] provided the exact ground
state and the quasiparticle-dispersion relation of the Kondo lattice model
with one conduction electron. The quasiparticle could be identified as the
spin polaron. Our calculations of the dispersion relation for partial band
fillings give a result similar to the one-electron case, which suggests that
the quasiparticle in both cases is the spin polaron. We find that the
quasiparticle lifetime differs by orders of magnitude between the
ferromagnetic and paramagnetic phases and depends strongly on the quasimomentum. |
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