Evolution of entanglement entropy in strongly correlated bosons in an optical lattice

TL;DR

This paper studies how the second-order Rényi entropy evolves over time in strongly correlated bosons in a 1D optical lattice after a quench, revealing a relation to doublon-holon pairs and providing new insights into entanglement dynamics in such systems.

Contribution

The paper introduces an effective theory linking Rényi entropy to doublon-holon pair populations, offering a novel quasiparticle perspective on entanglement dynamics in strongly correlated bosonic systems.

Findings

Rényi entropy is proportional to doublon-holon pair boundary population.

Developed an analytical relation between RE and correlation functions.

Provided a quasiparticle picture distinct from free-fermion models.

Abstract

We investigate the time evolution of the second-order R\'enyi entropy (RE) for bosons in a one-dimensional optical lattice following a sudden quench of the hopping amplitude $J$. Specifically, we examine systems that are quenched into the strongly correlated Mott-insulating (MI) regime with $J/U\ll 1$ ($U$ denotes the strength of the on-site repulsive interaction) from the MI limit with $J=0$. In this regime, the low-energy excited states can be effectively described by fermionic quasiparticles known as doublons and holons. They are excited in entangled pairs through the quench dynamics. By developing an effective theory, we derive a direct relation between the RE and correlation functions associated with doublons and holons. This relation allows us to analytically calculate the RE and obtain a physical picture for the RE, both in the ground state and during time evolution through the quench dynamics, in terms of doublon holon pairs. In particular, we show that the RE is proportional to the population of doublon-holon pairs that span the boundary of the subsystem. Our quasiparticle picture introduces some remarkable features that are absent in previous studies on the dynamics of entanglement entropy in free-fermion models. It provides with valuable insights into the dynamics of entanglement entropy in strongly-correlated systems.