Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Correlated Electrons: Low-dimensional Systems - Models
TT 24.9: Vortrag
Mittwoch, 27. Februar 2008, 16:15–16:30, H 2053
The magnetic polaron in the one-dimensional Kondo lattice model away from half filling — •Sebastian Smerat1,2, Ian P. McCulloch3, Ulrich Schollwöck2, and Herbert Schoeller1 — 1Institut für Theoretische Physik A, RWTH Aachen, D-52056 Aachen, Deutschland — 2Institut für Theoretische Physik C, RWTH Aachen, D-52056 Aachen, Deutschland — 3School of Physical Sciences, the University of Queensland, QLD 4072, Australia
Recent progress in the fabrication of nanosized materials may in the near future allow to load nanotubes with, e.g., fullerenes. We expect the magnetic and transport properties of such materials to be adequately described by a one-dimensional Kondo lattice model. This motivates our numerical analysis of the model. Our main focus is on the properties of magnetic polarons, which previously have been argued to exist in both the limit of a half-filled and an empty conduction band. Using a state-of-the-art numerical method, the density matrix renormalization group algorithm, we compute the spectral functions of the model as a function of filling. As a main result, we provide clear evidence for the existence of the magnetic polaron away from half filling. A careful analysis of the spectral functions allows us to determine lower bounds for the quasi-particle life-time.