TL;DR
This paper investigates how entanglement entropy evolves over time in a free-electron chain after a local defect is removed, revealing a logarithmic growth and gradual relaxation influenced by defect strength.
Contribution
It provides a detailed analysis of entanglement dynamics following a local quench in a free-electron system, highlighting the continuous dependence on defect strength.
Findings
Entanglement entropy grows logarithmically after defect removal.
Relaxation towards homogeneous chain entropy is slow.
Coefficients depend continuously on defect strength.
Abstract
We study free electrons on an infinite half-filled chain, starting in the ground state with a bond defect. We find a logarithmic increase of the entanglement entropy after the defect is removed, followed by a slow relaxation towards the value of the homogeneous chain. The coefficients depend continuously on the defect strength.
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