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Entanglement spreading and quasiparticle picture beyond the pair structure

by Alvise Bastianello, Mario Collura

Submission summary

As Contributors: Alvise Bastianello · Mario Collura
Arxiv Link: https://arxiv.org/abs/2001.01671v2
Date submitted: 2020-01-15
Submitted by: Bastianello, Alvise
Submitted to: SciPost Physics
Discipline: Physics
Subject area: Quantum Physics
Approach: Theoretical

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.

Current status:
Editor-in-charge assigned


Submission & Refereeing History

Submission 2001.01671v2 on 15 January 2020

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