Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 15: Spin-Dependent Transport Phenomena II
MA 15.5: Vortrag
Dienstag, 28. März 2006, 11:15–11:30, HSZ 103
Structure and dynamics of magnetic polarons in one-dimensional antiferromagnetic semiconductors — •Yaroslav Prylepskiy1, Alexander Kovalev1, Magnus Johansson2, and Yuri Kivshar3 — 1B.I. Verkin Institute for Low Temperature Physics and Engineering, 61103, Kharkov, Ukraine — 2Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden — 3Nonlinear Physics Center, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, Australia
Based on the one-dimensional Anderson-Hasegawa (AH) double-exchange model we present several families of polaron-type localized solutions, which have collinear and canted arrangement of lattice spins. To study the stability and nontrivial dynamics of magnetic polarons we propose a generalization of the AH model, within which the lattice spins have a finite magnitude. By means of this generalized approach we derive the self-consistent quasiclassical dynamical equations for both the itinerant currier and (classical) lattice spin fields. Then we proceed to find the stationary localized solutions being focused, in particular, on the mobile solutions. Eventually we address the issue of dynamical stability for the several typical polarons having collinear and canted structure and find the solution recognized as a stable mobile polaron.