Twist-angle dependent dehybridization of momentum-indirect excitons in MoSe2 /MoS2 heterostructures
Artikel i vetenskaplig tidskrift, 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
Författare
Nikodem Sokolowski
Centre national de la recherche scientifique (CNRS)
Swaroop Palai
Centre national de la recherche scientifique (CNRS)
Mateusz Dyksik
Politechnika Wrocławska
Katarzyna Posmyk
Politechnika Wrocławska
Centre national de la recherche scientifique (CNRS)
M Baranowski
Politechnika Wrocławska
Alessandro Surrente
Politechnika Wrocławska
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, Fysik, Kondenserad materie- och materialteori
Samuel Brem
Philipps-Universität Marburg
Andres Castellanos-Gomez
CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
Ermin Malic
Chalmers, Fysik, Kondenserad materie- och materialteori
Philipps-Universität Marburg
Paulina Plochocka
Politechnika Wrocławska
Centre national de la recherche scientifique (CNRS)
2D Materials
2053-1583 (eISSN)
Vol. 10 3 034003IMplementing MEasuRes for Sustainable Estuaries (IMMERSE)
Europeiska kommissionen (EU) (J-No:38-2-9-17), 2018-07-01 -- 2021-12-31.
Graphene Core Project 3 (Graphene Flagship)
Europeiska kommissionen (EU) (EC/H2020/881603), 2020-04-01 -- 2023-03-31.
Ämneskategorier
Atom- och molekylfysik och optik
Annan fysik
Den kondenserade materiens fysik
DOI
10.1088/2053-1583/acdbdb