Excitons without effective mass: biased bilayer graphene
Abstract
Understanding the dynamics of excitons in two dimensional semiconductors requires a theory that incorporates the essential physics distinct from their three-dimensional counterparts. In addition to the modified dielectric environment, single-particle states with strongly non-parabolic dispersion appear in many two-dimensional band structures, so that "effective mass" is ill-defined. Focusing on electrostatically-biased bilayer graphene as an example where quartic (and higher) dispersion terms are necessary, we present a semi-analytic theory used to investigate the properties of ground and excited excitonic states. This includes determination of relative oscillator strengths and magnetic moments (g-factors) which can be directly compared to recent experimental measurements.
Cite
@article{arxiv.1808.09893,
title = {Excitons without effective mass: biased bilayer graphene},
author = {Pengke Li and Ian Appelbaum},
journal= {arXiv preprint arXiv:1808.09893},
year = {2019}
}
Comments
SM upon request