{
  "abstract": "Interlayer excitons in transition-metal dichalcogenide heterobilayers possess intrinsic out-of-plane dipole moments, providing a platform for investigating exciton-exciton interactions at high densities. Here, we use excitation-energy-dependent photoluminescence excitation (PLE) spectroscopy to probe the nonlinear response of dipolar interlayer excitons in chemical vapor deposition-grown MoSe$_2$/WSe$_2$ heterobilayers. By tuning the excitation energy across intralayer exciton resonances at fixed excitation power, we selectively vary the population injected into the interlayer exciton states. Resonant excitation drives the system into a nonlinear regime, leading to saturation of the interlayer exciton photoluminescence and an apparent broadening of the intralayer $1s$ resonances in the PLE spectra. At the same time, the interlayer exciton emission exhibits a pronounced blueshift, reaching approximately 2.5 meV at 4 K and 1 meV at 75 K. The blueshift increases systematically with the interlayer exciton population and is consistent with a net repulsive exciton-exciton interaction, with contributions from dipole-dipole repulsion in the density regime investigated. Our results establish PLE as a sensitive approach for accessing the nonlinear, high-density regime of interlayer excitons and probing their interactions in van der Waals heterostructures.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.01149",
  "author_total": 13,
  "authors": [
    {
      "name": "Sai Shradha"
    },
    {
      "name": "Luc F. Oswald"
    },
    {
      "name": "Md Tarik Hossain"
    },
    {
      "name": "Lukas Krelle"
    },
    {
      "name": "Nicole Engel"
    },
    {
      "name": "Axel Printschler"
    },
    {
      "name": "Julian Führer"
    },
    {
      "name": "Honey Jayeshkumar Shah"
    },
    {
      "name": "Daria I. Markina"
    },
    {
      "name": "Kenji Watanabe"
    },
    {
      "name": "Takashi Taniguchi"
    },
    {
      "name": "Andrey Turchanin"
    },
    {
      "name": "Bernhard Urbaszek"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/aa4p48e8wbx9r.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.01149",
  "fulltext_url": null,
  "id": "aa4p48e8wbx9r",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.01149",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "2505|2D Materials and Applications"
    ]
  ],
  "openalex": "W7206168492",
  "pdf_url": "https://arxiv.org/pdf/2609.01149",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/aa4p48e8wbx9r.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:00Z",
      "native_id": "2609.01149",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.01149"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Probing Nonlinear Interactions of Dipolar Interlayer Excitons in MoSe$_2$/WSe$_2$ Heterobilayers",
  "title_text": "Probing Nonlinear Interactions of Dipolar Interlayer Excitons in MoSe_2/WSe_2 Heterobilayers",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:00Z",
  "url": "https://research.draconitic.com/paper/aa4p48e8wbx9r",
  "venue": "arXiv",
  "versions": []
}