Article Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice

Aidan J. Campbell ; Mauro Brotons-Gisbert ; Hyeonjun Baek ; Valerio Vitale ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; Johannes Lischner ; Brian D. Gerardot

s41699-022-00358-w.pdf
Download file (1.71 MB)
Download as zip (1.23 MB)
Collection

Citation
Aidan J. Campbell, Mauro Brotons-Gisbert, Hyeonjun Baek, Valerio Vitale, Takashi Taniguchi, Kenji Watanabe, Johannes Lischner, Brian D. Gerardot. Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice. npj 2D Materials and Applications. 2022, 6 (1), 79.
SAMURAI

Description:

(abstract)

Two-dimensional moiré materials provide a highly tunable platform to investigate strongly correlated electronic states. Such emergent many-body phenomena can be optically probed in moiré systems created by stacking two layers of transition metal dichalcogenide semiconductors: opti- cally injected excitons can interact with itinerant carriers occupying narrow moiré bands to form exciton-polarons sensitive to strong correlations. Here, we investigate the many-body interactions between excitons and a Fermi sea that is spatially pinned by the moiré superlattice of a molybdenum diselenide (MoSe2) / tungsten diselenide (WSe2) twisted heterobilayer. At a multitude of fractional fillings of the moiré lattice, we observe ordering of both electrons and holes into stable correlated electronic states. Magneto-optical measurements reveal extraordinary Zeeman splittings of the exciton-polarons due to exchange interactions between holes in the correlated phases, with a maximum close to the correlated state at one hole per site. The temperature dependence of the Zeeman splitting reveals anti-ferromagnetic ordering of the correlated holes across a wide range of fractional fillings. Our results illustrate the nature of excitons interacting with a spatially pinned Fermi sea and provide robust evidence for strongly correlated electronic states in MoSe2/WSe2 het- erobilayers, unveiling the rich potential of this platform for investigations of Fermi-Hubbard and Bose-Hubbard physics.

Rights:

Keyword: Moiré materials, exciton-polarons, correlated electronic states

Date published: 2022-11-04

Publisher: Springer Science and Business Media LLC

Journal:

  • npj 2D Materials and Applications (ISSN: 23977132) vol. 6 issue. 1 79

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41699-022-00358-w

Related item:

Other identifier(s):

Contact agent:

Updated at: 2025-02-28 08:31:07 +0900

Published on MDR: 2025-02-28 08:31:07 +0900

Filename Size
Filename s41699-022-00358-w.pdf (Thumbnail)
application/pdf 		Size 1.71 MB Detail