{
  "abstract": "Topological insulators (TIs) with hexagonally warped Fermi surface are natural platforms for the nonlinear Hall effect, as warping breaks inversion symmetry while preserving time-reversal symmetry (TRS). Here we show that this inversion breaking alone is insufficient: although warping generates a strongly anisotropic Berry curvature, the preserved threefold rotational symmetry forces the equilibrium Berry curvature dipole (BCD) to vanish identically. We demonstrate that linearly polarized light removes this symmetry obstruction: in the off-resonant Floquet regime, it lowers the rotational symmetry while preserving TRS, thereby generating a finite BCD whose magnitude, orientation, and sign are continuously tunable by the light intensity and polarization. For realistic Bi$_2$Te$_3$ parameters, we show that the induced BCD reaches $\\sim$0.03~nm, yielding microampere-scale nonlinear Hall currents under experimentally accessible conditions. Our results therefore establish Floquet symmetry engineering as a route to activating the symmetry-forbidden nonlinear transport on TI surfaces without breaking the TRS.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.15460",
  "author_total": 3,
  "authors": [
    {
      "name": "Mohammad Shafiei"
    },
    {
      "name": "Farhad Fazileh"
    },
    {
      "name": "Milorad V. Milošević"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6bjq9sqm5xwm6.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.15460",
  "fulltext_url": null,
  "id": "6bjq9sqm5xwm6",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.15460",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.15460",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6bjq9sqm5xwm6.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.15460",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.15460"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Optical activation of nonlinear Hall effect in topological insulators with warped Fermi surface",
  "title_text": "Optical activation of nonlinear Hall effect in topological insulators with warped Fermi surface",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/6bjq9sqm5xwm6",
  "venue": "arXiv",
  "versions": []
}