{
  "abstract": "Characterizing carrier type in strongly correlated quantum systems conventionally relies on the Hall effect. In cold-atom quantum simulators, implementing Hall transport measurements typically requires synthetic gauge fields, which introduces significant heating. Here, we present nonlinear spectroscopic and fluctuation-based protocols that establish an alternative route to identifying the sign of quasiparticle charge. We demonstrate that second-order density and current responses to finite-momentum quenches and drives-as well as equilibrium third-order density cumulants-distinguish electron- from hole-like quasiparticles. For a Fermi-Hubbard multi-leg ladder on a square lattice, numerical simulations reveal a crossover from hole- to electron-like carriers upon hole-doping away from half-filling, matching the sign change in the Hall coefficient. To demonstrate the applicability of our protocols beyond fermionic systems, we show that the nonlinear density response to a finite-momentum, finite-frequency drive reveals the sign of charge carriers in a hard-core boson ladder, and that the nonlinear signal can be significantly enhanced when driving near resonance with a nonlinear collective mode. Our results establish nonlinear density and current response and equilibrium non-Gaussian fluctuations as complementary probes, offering quantum simulators a direct route to characterize the carrier sign, without the experimental hurdles of conventional transport setups.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.30124",
  "author_total": 5,
  "authors": [
    {
      "name": "Luka Skolc"
    },
    {
      "name": "Utso Bhattacharya"
    },
    {
      "name": "Jonathan B. Curtis"
    },
    {
      "name": "Immanuel Bloch"
    },
    {
      "name": "Eugene Demler"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/eqvq7enzpjx3v.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.30124",
  "fulltext_url": null,
  "id": "eqvq7enzpjx3v",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.30124",
  "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.quant-gas"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "3107|Cold Atom Physics and Bose-Einstein Condensates"
    ]
  ],
  "openalex": "W7214325091",
  "pdf_url": "https://arxiv.org/pdf/2609.30124",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/eqvq7enzpjx3v.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:11Z",
      "native_id": "2609.30124",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.30124"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "amo"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Characterizing quasiparticles in strongly correlated systems using nonlinear spectroscopy in quantum simulators",
  "title_text": "Characterizing quasiparticles in strongly correlated systems using nonlinear spectroscopy in quantum simulators",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:11Z",
  "url": "https://research.draconitic.com/paper/eqvq7enzpjx3v",
  "venue": "arXiv",
  "versions": []
}