{
  "abstract": "The bulk photovoltaic effect (BPVE) provides a direct link between quantum geometry and nonlinear light-matter interactions, yet conventional far-field measurements cannot disentangle BPVE from contact- and interface-induced photothermoelectric signals. Here we develop cryogenic, polarization-sensitive terahertz microscopy with deep-subwavelength resolution and apply it to dual-gated AB bilayer graphene. Near resonance between the band gap and terahertz photon energy, we observe enhanced optical conductivity and spatially resolved BPVE. Polarization-dependent measurements reveal a characteristic twofold angular symmetry and a distinct shift-vector direction, both governed by crystalline symmetries and quantum geometry. The evolution of BPVE with carrier density and temperature provides a sensitive probe of the fine electronic structure of bilayer graphene, revealing signatures of trigonal warping and electron-hole asymmetry. Agreement with theory demonstrates that the terahertz nanoscopy of BPVE established here offers an optical lens into the interplay between band and quantum geometry in quantum materials.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.05620",
  "author_total": 10,
  "authors": [
    {
      "name": "Bogdan Borodin"
    },
    {
      "name": "Jiangxu Li"
    },
    {
      "name": "Xuanpu Zhang"
    },
    {
      "name": "Aleksei Karaborchev"
    },
    {
      "name": "Som Subhra Guria"
    },
    {
      "name": "Kenji Watanabe"
    },
    {
      "name": "Takashi Taniguchi"
    },
    {
      "name": "Roshan Krishna Kumar"
    },
    {
      "name": "Fan Zhang"
    },
    {
      "name": "Petr Stepanov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4yc6m6ah1ymva.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.05620",
  "fulltext_url": null,
  "id": "4yc6m6ah1ymva",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.05620",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mes-hall"
    ],
    [
      "openalex",
      "3107|Topological Materials and Phenomena"
    ]
  ],
  "openalex": "W7220692051",
  "pdf_url": "https://arxiv.org/pdf/2610.05620",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4yc6m6ah1ymva.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2610.05620",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.05620"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Terahertz nanoscopy of quantum-geometric photovoltaics in bilayer graphene",
  "title_text": "Terahertz nanoscopy of quantum-geometric photovoltaics in bilayer graphene",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/4yc6m6ah1ymva",
  "venue": "arXiv",
  "versions": []
}