{
  "abstract": "The quantum geometric properties of Bloch electrons fundamentally govern light-matter interactions and optical selection rules in solids. In semiconducting transition-metal dichalcogenides, circularly polarized excitation near the band edge enables valley-selective interband transitions, providing the basis for valleytronics. While nonlinear optical protocols are being developed to manipulate and probe valley selection rules, they largely rely on band-edge transitions that proceed via virtual intermediate states. Here, we demonstrate a doubly resonant cascaded nonlinear pathway from the valence band to high-lying states, mediated by a real intermediate state whose participation substantially reshapes the valley optical selection rules. Using time- and angle-resolved extreme-ultraviolet photoemission spectroscopy in combination with a time-dependent Lindblad master-equation formalism, we show that this cascaded nonlinear photoexcitation produces a substantially enhanced high-lying valley polarization compared to the conventional linear optical response near the band edge. The extension of the quantum-geometry-based selection rules to the nonlinear regime and high-lying bands offers new perspectives for ultrafast valleytronics and should play a determinant role in strong-field-driven phenomena in quantum materials.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 7,
  "authors": [
    {
      "name": "Quentin Courtade"
    },
    {
      "name": "Sotirios Fragkos"
    },
    {
      "name": "Dominique Descamps"
    },
    {
      "name": "Stéphane Petit"
    },
    {
      "name": "Yann Mairesse"
    },
    {
      "name": "Michael Schüler"
    },
    {
      "name": "Samuel Beaulieu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1qc1wmstcf8td.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.03663",
  "fulltext_url": null,
  "id": "1qc1wmstcf8td",
  "issns": [],
  "landing_url": "https://hal.science/hal-05778004v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.nlin"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.cond"
    ],
    [
      "hal",
      "1.phys.phys"
    ],
    [
      "hal",
      "2.phys.cond.cm-ms"
    ],
    [
      "hal",
      "2.phys.phys.phys-optics"
    ],
    [
      "openalex",
      "2505|2D Materials and Applications"
    ]
  ],
  "openalex": "W7160388842",
  "pdf_url": "https://hal.science/hal-05778004/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1qc1wmstcf8td.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T12:20:13Z",
      "native_id": "hal-05778004",
      "source": "hal",
      "url": "https://hal.science/hal-05778004v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:1.phys.cond",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "hal:2.phys.phys.phys-optics",
      "subfield": "optics-photonics"
    },
    {
      "field": "physics",
      "origin": "hal:0.nlin",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Enhanced Valley Polarization via Nonlinear Cascaded Quantum-Geometric Selection Rules",
  "title_text": "Enhanced Valley Polarization via Nonlinear Cascaded Quantum-Geometric Selection Rules",
  "type": "preprint",
  "updated_at": "2026-11-07T12:20:25Z",
  "url": "https://research.draconitic.com/paper/1qc1wmstcf8td",
  "venue": "HAL",
  "versions": []
}