Impact of magnetic fields on polaron dynamics in low-dimensional systems

TL;DR

This paper investigates how external magnetic fields influence polaron behavior and electron transport in low-dimensional materials, revealing dependencies on field strength and system parameters through numerical solutions of discrete nonlinear equations.

Contribution

It introduces a numerical approach to study magnetic effects on polarons in discrete systems, moving beyond the continuum approximation and considering various system parameters.

Findings

Magnetic field effects depend on system parameters and soliton properties.

Strong electron-lattice interaction leads to stable large polarons or solitons.

Magnetic fields influence polaron dynamics differently based on their origin and system characteristics.

Abstract

We study the impact of an external magnetic field on the long-range electron transport in quasi-one-dimensional materials, such as polypeptides, (semi-) conducting polymers and macromolecules, taking into account the electron-lattice interaction. At relatively strong electron-lattice interaction extra electrons get self-trapped in the deformation potential well and form stable bound states, called large polarons which in the continuum approximation are known as solitons. Here we do not use the continuum approximation but solve the system of discrete nonlinear equations numerically. We show that the impact of a magnetic field on polaron dynamics depends not only on the field strength, but also on the parameter values of the system which define the properties of solitons such as their energy, amplitude and width of localisation. We also study the impact of a magnetic field on a polaron created by a donor complex on a chain.