Twist-angle dependent dehybridization of momentum-indirect excitons in MoSe2 /MoS2 heterostructures
Journal article, 2023
The moiré superlattice has emerged as a powerful way to tune excitonic properties in two-dimensional van der Waals structures. However, the current understanding of the influence of the twist angle for interlayer excitons (IXs) in heterostructures is mainly limited to momentum-direct K-K transitions. In this work, we use a judicious combination of spectroscopy and many-particle theory to investigate the influence of the twist angle on momentum-indirect IXs of a MoSe2/MoS2 heterostructure. Here, the energetically lowest state is a dark and strongly hybridized ΓK exciton. We show that increasing the twist angle from an aligned structure (0∘ or 60∘) gives rise to a large blue shift of the IX, which is a manifestation of the strong dehybridization of this state. Moreover, for small twist angle heterostructures, our photoluminescence measurements reveal contributions from two IX states, which our modelling attributes to transitions from different moiré minibands. Our finding contributes to a better fundamental understanding of the influence of the moiré pattern on the hybridization of momentum-dark IX states, which may be important for applications in moiré-tronics including novel quantum technologies.
MoSe /MoS 2 2
interlayer exciton
twist angle
moiré
photoluminescence
heterostructure
transition metal dichalcogenide
Author
Nikodem Sokolowski
Centre national de la recherche scientifique (CNRS)
Swaroop Palai
Centre national de la recherche scientifique (CNRS)
Mateusz Dyksik
Wrocław University of Science and Technology
Katarzyna Posmyk
Wrocław University of Science and Technology
Centre national de la recherche scientifique (CNRS)
M Baranowski
Wrocław University of Science and Technology
Alessandro Surrente
Wrocław University of Science and Technology
D. K. Maude
Centre national de la recherche scientifique (CNRS)
Felix Carrascoso
CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
Onur Cakiroglu
CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
Estrella Sanchez
CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
Alina Schubert
CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
Carmen Munuera
CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
Takashi Taniguchi
National Institute for Materials Science (NIMS)
Kenji Watanabe
National Institute for Materials Science (NIMS)
Joakim Hagel
Chalmers, Physics, Condensed Matter and Materials Theory
Samuel Brem
Philipps University Marburg
Andres Castellanos-Gomez
CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
Ermin Malic
Chalmers, Physics, Condensed Matter and Materials Theory
Philipps University Marburg
Paulina Plochocka
Wrocław University of Science and Technology
Centre national de la recherche scientifique (CNRS)
2D Materials
2053-1583 (eISSN)
Vol. 10 3 034003IMplementing MEasuRes for Sustainable Estuaries (IMMERSE)
European Commission (EC) (J-No:38-2-9-17), 2018-07-01 -- 2021-12-31.
Graphene 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
10.1088/2053-1583/acdbdb