Eur. Phys. J. B (2012) 85: 95
https://doi.org/10.1140/epjb/e2012-20782-2

Regular Article

Stationary soliton solutions for large adiabatic Holstein polaron in magnetic field in anisotropic solids

¹ “Vinča” Institute of Nuclear Sciences, Laboratory for Theoretical and Condensed matter physics-020, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia
² Department of Physics, Faculty of Science, University of Novi Sad, Trg Dositeja Obradovica 4, 21000 Novi Sad, Serbia

^a e-mail: zivic@vinca.rs

Received: 21 September 2011
Received in final form: 29 December 2011
Published online: 14 March 2012

Abstract

Large adiabatic polarons in anisotropic crystals in the presence of constant magnetic field have been studied within the Holstein molecular crystal model in the continuum approximation. It was shown that magnetic field directed along the symmetry axis induces transverse confinement which may stabilize large polarons. They represent localized (soliton-like) nonlinear structure uniformly propagating along the symmetry axis and rotating around it in the same time. Such objects exist in 3D lattice provided that coupling constant and magnetic field do not exceed certain critical values. In contrast with pure 1D systems existence of large polarons is possible in a quite wider region of the values of coupling constant which may attain considerably higher values than in the pure 1D media. Furthermore, polaron effective mass, depending on the intensity of the applied magnetic field, may be considerably lighter than that of the the pure 1D polarons for the same values of coupling constant. This is the most significant difference with respect to pure 1D systems in the absence of magnetic field and may have substantial impact on polaron transport properties.