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.

moiré

interlayer exciton

photoluminescence

MoSe /MoS 2 2

heterostructure

twist angle

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

Centre national de la recherche scientifique (CNRS)

Politechnika Wrocławska

M Baranowski

Politechnika Wrocławska

Alessandro Surrente

Politechnika Wrocławska

D. K. Maude

Centre national de la recherche scientifique (CNRS)

Felix Carrascoso

Consejo Superior de Investigaciones Científicas (CSIC)

Onur Cakiroglu

Consejo Superior de Investigaciones Científicas (CSIC)

Estrella Sanchez

Consejo Superior de Investigaciones Científicas (CSIC)

Alina Schubert

Consejo Superior de Investigaciones Científicas (CSIC)

Carmen Munuera

Consejo Superior de Investigaciones Científicas (CSIC)

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

Consejo Superior de Investigaciones Científicas (CSIC)

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 034003

IMplementing 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 (SSIF 2011)

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1088/2053-1583/acdbdb

Mer information

Senast uppdaterat

2025-03-09