{
  "abstract": "Tensor-network methods have opened a powerful route for the study of dynamical spectral functions in two-dimensional quantum systems. However, existing approaches within the framework of infinite projected entangled-pair states construct the required renormalization tensors solely from the ground-state environment and can suffer from severe numerical instability. We identify the origin of this instability and introduce an excitation-tailored corner-transfer-matrix renormalization-group (ET-CTMRG) method to resolve it. By incorporating excitation tensors into the renormalization procedure, the method constructs a substantially more accurate effective Hamiltonian matrix and thereby yields reliable and well-converged excitation spectra. For Heisenberg antiferromagnets, it reduces truncation errors by orders of magnitude and for the particularly complex case of the supersolid phase in the triangular-lattice XXZ magnet $\\mathrm{K_2Co(SeO_3)_2}$, it achieves excellent quantitative agreement with inelastic neutron-scattering measurements. ET-CTMRG therefore provides a robust framework for investigating the dynamical properties of strongly correlated quantum systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.02473",
  "author_total": 5,
  "authors": [
    {
      "name": "Jiahang Hu"
    },
    {
      "name": "Runze Chi"
    },
    {
      "name": "B. Normand"
    },
    {
      "name": "Hai-Jun Liao"
    },
    {
      "name": "T. Xiang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/b5zhb50gcsqa3.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.02473",
  "fulltext_url": null,
  "id": "b5zhb50gcsqa3",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.02473",
  "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.str-el"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Quantum many-body systems"
    ]
  ],
  "openalex": "W7172428563",
  "pdf_url": "https://arxiv.org/pdf/2608.02473",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/b5zhb50gcsqa3.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2608.02473",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.02473"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Optimized Tensor-Network Renormalization for Quantum Dynamics: Resolving the Spectral Function of $\\mathrm{K_2Co(SeO_3)_2}$",
  "title_text": "Optimized Tensor-Network Renormalization for Quantum Dynamics: Resolving the Spectral Function of K_2Co(SeO_3)_2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/b5zhb50gcsqa3",
  "venue": "arXiv",
  "versions": []
}