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...
Main Author: | |
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Format: | Article |
Language: | English |
Published: |
SciPost
2020-03-01
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Series: | SciPost Physics |
Online Access: | https://scipost.org/SciPostPhys.8.3.045 |
Summary: | 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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ISSN: | 2542-4653 |