Excitons in van der Waals heterostructures based on atomically thin transition metal dichalcogenides are considered as potential candidates for the formation of a superfluid state in two-dimensional systems. A number of studies reported observations of ultrafast nondiffusive propagation of excitons in van der Waals heterostructures, which was considered by their authors as possible evidence of collective effects in excitonic systems. In this paper, after a brief analysis of exciton propagation regimes in two-dimensional semiconductors, an alternative model of ultrafast exciton transport is proposed, based on the formation of waveguide modes in van der Waals heterostructures and the radiation transfer by these modes.
@article{arxiv.2403.19571,
title = {Ultrafast exciton transport in van der Waals heterostructures},
author = {M. M. Glazov and R. A. Suris},
journal= {arXiv preprint arXiv:2403.19571},
year = {2024}
}
Comments
Submitted to the special issue of Journal of Experimental and Theoretical Physics devoted to 130th anniversary of P.L. Kapitza. 8+ pages, 3 figures. Version 2: role of hBN is stressed