Interaction potential between dynamic dipoles: polarized excitons in strong magnetic fields
Abstract
The interaction potential of a two-dimensional system of excitons with spatially separated electron-hole layers is considered in the strong magnetic field limit. The excitons are assumed to have free dynamics in the - plane, while being constrained or `polarized' in the direction. The model simulates semiconductor double layer systems under strong magnetic field normal to the layers. The {\em residual} interaction between excitons exhibits interesting features, arising from the coupling of the center-of-mass and internal degrees of freedom of the exciton in the magnetic field. This coupling induces a dynamical dipole moment proportional to the center-of-mass magnetic moment of the exciton. We show the explicit dependence of the inter-exciton potential matrix elements, and discuss the underlying physics. The unusual features of the interaction potential would be reflected in the collective response and non-equilibrium properties of such system.
Keywords
Cite
@article{arxiv.cond-mat/0012131,
title = {Interaction potential between dynamic dipoles: polarized excitons in strong magnetic fields},
author = {M. A. Olivares-Robles and S. E. Ulloa},
journal= {arXiv preprint arXiv:cond-mat/0012131},
year = {2009}
}
Comments
REVTEX - 11 pages - 1 fig