Ultrafast exciton transport in van der Waals heterostructures
arxiv(2024)
摘要
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.
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