Layer-Dependent Interfacial Coupling and Exciton Pinning in WSe2/Graphene Heterostructures

[2509.08340] Layer-Dependent Interfacial Coupling and Exciton Pinning in WSe2/Graphene Heterostructures Skip to main content Search Submit Donate Log in Condensed Matter > Materials Science arXiv:2509.08340 (cond-mat) [Submitted on 10 Sep 2025 ( v1 ), last revised 25 Aug 2026 (this version, v2)] Title: Layer-Dependent Interfacial Coupling and Exciton Pinning in WSe2/Graphene Heterostructures Authors: Lan Huang , Laric Bobzien , Ángel Labordet Álvarez , Daniel E. Cintron Figueroa , Li-Syuan Lu , Chengye Dong , Michel Calame , Joshua A. Robinson , Bruno Schuler , Mirjana Dimitrievska View PDF HTML (experimental) Abstract: Understanding interfacial interactions in two-dimensional heterostructures is crucial for their implementation in future optoelectronic and quantum technologies. Here, we investigate interactions between WSe2 and graphene by comparing 1-5 layer MOCVD-grown WSe2 on graphene/SiC with exfoliated WSe2 on SiO2/Si using Raman and photoluminescence spectroscopy combined with atomic force microscopy. Growth on graphene induces persistent compressive strain of approximately 0.2% and reduces the interlayer WSe2 distance by 0.11 +/- 0.05 Angstrom. Interfacial disorder is strongest in the WSe2 layer directly contacting graphene, with an effective Urbach energy of approximately 20 meV, decreasing to approximately 16 meV upon addition of a second layer and remaining similar for thicker films. Increasing WSe2 thickness leads to progressive electron transfer from graphene to WSe2, resulting in p-type doping of graphene and n-type doping of WSe2, with the graphene hole density increasing from approximately 0.4 x 10^13 cm^-2 for 1L to 0.8 x 10^13 cm^-2 for 5L. The A- and B-exciton energies of WSe2 remain nearly pinned on graphene, in contrast to their pronounced thickness-dependent shifts on SiO2/Si. We show that this pinning arises primarily from electronic screening and compressive strain, with smaller contributions from charge transfer and modified interlayer coupling. These findings establish graphene as an active interface for controlling excitonic properties in scalable van der Waals heterostructures. Subjects: Materials Science (cond-mat.mtrl-sci) ; Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:2509.08340 [cond-mat.mtrl-sci] (or arXiv:2509.08340v2 [cond-mat.mtrl-sci] for this version) https://doi.org/10.48550/arXiv.2509.08340 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Mirjana Dimitrievska [ view email ] [v1] Wed, 10 Sep 2025 07:26:33 UTC (9,717 KB) [v2] Tue, 25 Aug 2026 09:55:48 UTC (25,361 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: cond-mat.mtrl-sci < prev | next > new | recent | 2025-09 Change to browse by: cond-mat cond-mat.mes-hall References & Citations SciX Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) IArxiv recommender toggle IArxiv Recommender ( What is IArxiv? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab) Major funding support from (opens in new tab) (opens in new tab) (opens in new tab)

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