Electrical control of hybrid exciton transport in a van der Waals heterostructure
Journal article, 2023
Interactions between out-of-plane dipoles in bosonic gases enable the long-range propagation of excitons. The lack of direct control over collective dipolar properties has so far limited the degrees of tunability and the microscopic understanding of exciton transport. In this work we modulate the layer hybridization and interplay between many-body interactions of excitons in a van der Waals heterostructure with an applied vertical electric field. By performing spatiotemporally resolved measurements supported by microscopic theory, we uncover the dipole-dependent properties and transport of excitons with different degrees of hybridization. Moreover, we find constant emission quantum yields of the transporting species as a function of excitation power with radiative decay mechanisms dominating over nonradiative ones, a fundamental requirement for efficient excitonic devices. Our findings provide a complete picture of the many-body effects in the transport of dilute exciton gases, and have crucial implications for studying emerging states of matter such as Bose–Einstein condensation and optoelectronic applications based on exciton propagation.
Author
Fedele Tagarelli
Swiss Federal Institute of Technology in Lausanne (EPFL)
Edoardo Lopriore
Swiss Federal Institute of Technology in Lausanne (EPFL)
Daniel Erkensten
Chalmers, Physics, Condensed Matter and Materials Theory
Raul Perea Causin
Chalmers, Physics, Condensed Matter and Materials Theory
Samuel Brem
Philipps University Marburg
Chalmers, Physics, Condensed Matter and Materials Theory
Joakim Hagel
Chalmers, Physics, Condensed Matter and Materials Theory
Zhe Sun
Swiss Federal Institute of Technology in Lausanne (EPFL)
Gabriele Pasquale
Swiss Federal Institute of Technology in Lausanne (EPFL)
Kenji Watanabe
National Institute for Materials Science (NIMS)
Takashi Taniguchi
National Institute for Materials Science (NIMS)
Ermin Malic
Philipps University Marburg
Chalmers, Physics, Condensed Matter and Materials Theory
A. Kis
Swiss Federal Institute of Technology in Lausanne (EPFL)
Nature Photonics
1749-4885 (ISSN) 17494893 (eISSN)
Vol. 17 7 615-621Graphene Core Project 3 (Graphene Flagship)
European Commission (EC) (EC/H2020/881603), 2020-04-01 -- 2023-03-31.
Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1038/s41566-023-01198-w