{
  "id": "2001.01671",
  "version": "v1",
  "published": "2020-01-06T17:14:19.000Z",
  "updated": "2020-01-06T17:14:19.000Z",
  "title": "Entanglement spreading and quasiparticle picture beyond the pair structure",
  "authors": [
    "Alvise Bastianello",
    "Mario Collura"
  ],
  "comment": "15 pages; 7 figures",
  "categories": [
    "cond-mat.stat-mech",
    "cond-mat.str-el",
    "quant-ph"
  ],
  "abstract": "The quasi-particle picture is a powerful tool to understand the entanglement spreading in many-body quantum systems after a quench. As an input, the structure of the excitations' pattern of the initial state must be provided, the common choice being pairwise-created excitations. However, several cases exile this simple assumption. In this work, we investigate weakly-interacting to free quenches in one dimension. This results in a far richer excitations' pattern where multiplets with a larger number of particles are excited. We generalize the quasi-particle ansatz to such a wide class of initial states, providing a small-coupling expansion of the Renyi entropies. Our results are in perfect agreement with iTEBD numerical simulations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-01-06T17:14:19.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quasiparticle picture",
      "pair structure",
      "entanglement spreading",
      "initial state",
      "many-body quantum systems"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}