Tunable Phases of Moiré Excitons in van der Waals Heterostructures Article Swipe
Samuel Brem
,
Christopher Linderälv
,
Paul Erhart
,
Ermin Malić
·
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.1021/acs.nanolett.0c03019
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.1021/acs.nanolett.0c03019
Stacking monolayers of transition metal dichalcogenides into a heterostructure with a finite twist-angle gives rise to artificial moiré superlattices with a tunable periodicity. As a consequence, excitons experience a periodic potential, which can be exploited to tailor optoelectronic properties of these materials. Whereas recent experimental studies have confirmed twist-angle-dependent optical spectra, the microscopic origin of moiré exciton resonances has not been fully clarified yet. Here, we combine first-principles calculations with the excitonic density matrix formalism to study transitions between different moiré exciton phases and their impact on optical properties of the twisted MoSe2/WSe2 heterostructure. At angles smaller than 2°, we find flat, moiré-trapped states for inter- and intralayer excitons. This moiré exciton phase changes into completely delocalized states at 3°. We predict a linear and quadratic twist-angle dependence of excitonic resonances for the moiré-trapped and delocalized exciton phases, respectively.
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- Type
- article
- Language
- nl
- Landing Page
- https://doi.org/10.1021/acs.nanolett.0c03019
- https://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.0c03019
- OA Status
- hybrid
- Cited By
- 121
- References
- 50
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W3048821544
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- OpenAlex ID
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https://openalex.org/W3048821544Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1021/acs.nanolett.0c03019Digital Object Identifier
- Title
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Tunable Phases of Moiré Excitons in van der Waals HeterostructuresWork title
- Type
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articleOpenAlex work type
- Language
-
nlPrimary language
- Publication year
-
2020Year of publication
- Publication date
-
2020-09-24Full publication date if available
- Authors
-
Samuel Brem, Christopher Linderälv, Paul Erhart, Ermin MalićList of authors in order
- Landing page
-
https://doi.org/10.1021/acs.nanolett.0c03019Publisher landing page
- PDF URL
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https://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.0c03019Direct link to full text PDF
- Open access
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YesWhether a free full text is available
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-
hybridOpen access status per OpenAlex
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https://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.0c03019Direct OA link when available
- Concepts
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Exciton, Delocalized electron, Condensed matter physics, van der Waals force, Heterojunction, Superlattice, Materials science, Stacking, Monolayer, Molecular physics, Physics, Nanotechnology, Quantum mechanics, Molecule, Nuclear magnetic resonanceTop concepts (fields/topics) attached by OpenAlex
- Cited by
-
121Total citation count in OpenAlex
- Citations by year (recent)
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2025: 23, 2024: 29, 2023: 23, 2022: 33, 2021: 12Per-year citation counts (last 5 years)
- References (count)
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50Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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