Entanglement spreading and quasiparticle picture beyond the pair structure

• URL: http://arxiv.org/abs/2001.01671v3
• Date: Mon, 16 Mar 2020 17:05:24 GMT
• Title: Entanglement spreading and quasiparticle picture beyond the pair structure
• Authors: Alvise Bastianello, Mario Collura
• Abstract summary: We investigate weakly-interacting to free quenches in one dimension. We generalize the quasi-particle ansatz to such a wide class of initial states.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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