Nonlocal effects and enhanced nonreciprocity in current-driven graphene systems
Abstract
A graphene sheet biased with a drift electric current offers a tantalizing opportunity to attain unidirectional, backscattering-immune, and subwavelength light propagation, as proposed in [T. A. Morgado, M. G. Silveirinha, ACS Photonics 5(11), 4253 (2018)]. Here, we investigate in detail the impact of the intrinsic nonlocal response of graphene in the dispersion characteristics of the current-driven plasmons supported by single-layer and double-layer graphene systems. It is theoretically shown that even though the nonlocal effects weaken the spectral asymmetry of the plasmons dispersion, the studied platforms can support unidirectional backscattering-immune guided modes. Our analysis also confirms that the drift-current bias can effectively pump the graphene plasmons and enhance the propagation distance. Moreover, it is shown that the nonreciprocity and optical isolation can be boosted by pairing two drift-current biased graphene sheets due to the enhanced radiation drag by the drifting electrons.
Cite
@article{arxiv.1912.01598,
title = {Nonlocal effects and enhanced nonreciprocity in current-driven graphene systems},
author = {Tiago A. Morgado and Mário G. Silveirinha},
journal= {arXiv preprint arXiv:1912.01598},
year = {2020}
}