Entanglement spreading and quasiparticle picture beyond the pair structure
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, sev...
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| Format: | Article |
| Language: | English |
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SciPost
2020-03-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.8.3.045 |
| _version_ | 1811215271380123648 |
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| author | Alvise Bastianello, Mario Collura |
| author_facet | Alvise Bastianello, Mario Collura |
| author_sort | Alvise Bastianello, Mario Collura |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-12T06:19:48Z |
| format | Article |
| id | doaj.art-e71ac424408a4517a85b7dddd6a12d63 |
| institution | Directory Open Access Journal |
| issn | 2542-4653 |
| language | English |
| last_indexed | 2024-04-12T06:19:48Z |
| publishDate | 2020-03-01 |
| publisher | SciPost |
| record_format | Article |
| series | SciPost Physics |
| spelling | doaj.art-e71ac424408a4517a85b7dddd6a12d632022-12-22T03:44:22ZengSciPostSciPost Physics2542-46532020-03-018304510.21468/SciPostPhys.8.3.045Entanglement spreading and quasiparticle picture beyond the pair structureAlvise Bastianello, Mario ColluraThe 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.https://scipost.org/SciPostPhys.8.3.045 |
| spellingShingle | Alvise Bastianello, Mario Collura Entanglement spreading and quasiparticle picture beyond the pair structure SciPost Physics |
| title | Entanglement spreading and quasiparticle picture beyond the pair structure |
| title_full | Entanglement spreading and quasiparticle picture beyond the pair structure |
| title_fullStr | Entanglement spreading and quasiparticle picture beyond the pair structure |
| title_full_unstemmed | Entanglement spreading and quasiparticle picture beyond the pair structure |
| title_short | Entanglement spreading and quasiparticle picture beyond the pair structure |
| title_sort | entanglement spreading and quasiparticle picture beyond the pair structure |
| url | https://scipost.org/SciPostPhys.8.3.045 |
| work_keys_str_mv | AT alvisebastianellomariocollura entanglementspreadingandquasiparticlepicturebeyondthepairstructure |