SciPost logo

Entanglement spreading and quasiparticle picture beyond the pair structure

Alvise Bastianello, Mario Collura

SciPost Phys. 8, 045 (2020) · published 20 March 2020


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.

Cited by 15

Crossref Cited-by

Ontology / Topics

See full Ontology or Topics database.

Entanglement Quantum many-body systems Quasiparticles

Authors / Affiliations: mappings to Contributors and Organizations

See all Organizations.
Funder for the research work leading to this publication