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    "title": "One-dimensional filling constraints connect electron counting to low-energy excitations",
    "summary": "Yamanaka, Oshikawa and Affleck used a nonperturbative twist argument to connect filling and translation symmetry to low-energy excitations in one-dimensional interacting electron systems. The construction fixes the momentum of a low-energy state, including a Kondo-chain counting relation that includes localized spins. Tasaki later supplied a self-contained local-twist extension: under the stated density-fluctuation and correlation conditions, local operations construct orthogonal low-energy states, and arbitrarily many such states occur below any fixed positive energy threshold in sufficiently large systems.",
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    "area": "Condensed matter theory / one-dimensional interacting particles",
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    "year": 1997,
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        "description": "These are conditional theorems for the specified local lattice models, not evidence for a particular material or for Fermi-liquid quasiparticles. The 1997 global-twist proof uses parity or time-reversal symmetry; the later treatment permits complex hopping through a variational argument and credits the earlier removal of that restriction to Koma. The local theorem requires controlled density fluctuations, and the multiple-state conclusion also requires decay of correlations of translated local twist operators. Excitations remain in the fixed-particle-number sector; charge-addition gaps, density-response singularities and spin-charge separation need additional reasoning.",
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      "sources": [
        {
          "citation": "Nonperturbative Approach to Luttinger’s Theorem in One Dimension (arXiv cond-mat/9701141v2)",
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      "statement": "# One-dimensional filling constraints connect electron counting to low-energy excitations\n\nYamanaka, Oshikawa and Affleck used a nonperturbative twist argument to connect filling and translation symmetry to low-energy excitations in one-dimensional interacting electron systems. The construction fixes the momentum of a low-energy state, including a Kondo-chain counting relation that includes localized spins. Tasaki later supplied a self-contained local-twist extension: under the stated density-fluctuation and correlation conditions, local operations construct orthogonal low-energy states, and arbitrarily many such states occur below any fixed positive energy threshold in sufficiently large systems.\n\n## Scientific scope\n\nThese are conditional theorems for the specified local lattice models, not evidence for a particular material or for Fermi-liquid quasiparticles. The 1997 global-twist proof uses parity or time-reversal symmetry; the later treatment permits complex hopping through a variational argument and credits the earlier removal of that restriction to Koma. The local theorem requires controlled density fluctuations, and the multiple-state conclusion also requires decay of correlations of translated local twist operators. Excitations remain in the fixed-particle-number sector; charge-addition gaps, density-response singularities and spin-charge separation need additional reasoning.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nMasanori Yamanaka; Masaki Oshikawa; Ian Affleck; Hal Tasaki\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Nonperturbative Approach to Luttinger’s Theorem in One Dimension (arXiv cond-mat/9701141v2)](https://arxiv.org/pdf/cond-mat/9701141v2)\n- [Lieb-Schultz-Mattis theorem with a local twist for general one-dimensional quantum systems (arXiv1708.05186v2)](https://arxiv.org/pdf/1708.05186v2)\n",
      "summary": "Yamanaka, Oshikawa and Affleck used a nonperturbative twist argument to connect filling and translation symmetry to low-energy excitations in one-dimensional interacting electron systems. The construction fixes the momentum of a low-energy state, including a Kondo-chain counting relation that includes localized spins. Tasaki later supplied a self-contained local-twist extension: under the stated density-fluctuation and correlation conditions, local operations construct orthogonal low-energy states, and arbitrarily many such states occur below any fixed positive energy threshold in sufficiently large systems.",
      "title": "One-dimensional filling constraints connect electron counting to low-energy excitations"
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    "title": "One-dimensional filling constraints connect electron counting to low-energy excitations",
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    "what_changed": "Yamanaka, Oshikawa and Affleck used a nonperturbative twist argument to connect filling and translation symmetry to low-energy excitations in one-dimensional interacting electron systems. The construction fixes the momentum of a low-energy state, including a Kondo-chain counting relation that includes localized spins. Tasaki later supplied a self-contained local-twist extension: under the stated density-fluctuation and correlation conditions, local operations construct orthogonal low-energy states, and arbitrarily many such states occur below any fixed positive energy threshold in sufficiently large systems.",
    "scope": "Yamanaka, Oshikawa and Affleck used a nonperturbative twist argument to connect filling and translation symmetry to low-energy excitations in one-dimensional interacting electron systems. The construction fixes the momentum of a low-energy state, including a Kondo-chain counting relation that includes localized spins. Tasaki later supplied a self-contained local-twist extension: under the stated density-fluctuation and correlation conditions, local operations construct orthogonal low-energy states, and arbitrarily many such states occur below any fixed positive energy threshold in sufficiently large systems. These are conditional theorems for the specified local lattice models, not evidence for a particular material or for Fermi-liquid quasiparticles. The 1997 global-twist proof uses parity or time-reversal symmetry; the later treatment permits complex hopping through a variational argument and credits the earlier removal of that restriction to Koma. The local theorem requires controlled density fluctuations, and the multiple-state conclusion also requires decay of correlations of translated local twist operators. Excitations remain in the fixed-particle-number sector; charge-addition gaps, density-response singularities and spin-charge separation need additional reasoning.",
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        "title": "Nonperturbative Approach to Luttinger’s Theorem in One Dimension (arXiv cond-mat/9701141v2)",
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