Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Focused Session: Spin Transport and Coherence in Emerging Materials

MA 28.6: Vortrag

Mittwoch, 25. März 2009, 17:00–17:15, HSZ 101

The Spin Polaron in the one-dimensional Kondo lattice model at partial fillings of the conduction band using the density matrix renormalization group — •Sebastian Smerat^1,3, Ian P. McCulloch⁴, Herbert Schoeller^2,3, and Ulrich Schollwöck^1,3 — ¹Insitut für theoretische Physik C, RWTH Aachen University — ²Insitut für theoretische Physik A, RWTH Aachen University — ³JARA-Fundamentals of Future Information Technology — ⁴School of physical Sciences, University of Queensland, Australia

We study the spectral properties of the one-dimensional Kondo lattice model as function of the exchange coupling, the band filling, and the quasimomentum in the ferromagnetic and paramagnetic phase. Using the density-matrix renormalization group method, we compute the dispersion relation of the quasiparticles, their lifetimes, and the Z-factor. As a main result, we provide evidence for the existence of the spinpolaron at partial band fillings. We find that the quasiparticle lifetime differs by orders of magnitude between the ferromagnetic and paramagnetic phase and depends strongly on the quasimomentum.