Entanglement Hamiltonian after a local quench
High Energy Physics - Theory
2025-08-28 v1 Statistical Mechanics
Quantum Physics
Abstract
We investigate the dynamics of the entanglement Hamiltonian in a system of one-dimensional free fermions, following a local joining quench of two initially disconnected half-chains in their ground states. Applying techniques of conformal field theory, we obtain a local expression where the left- and right-moving components of the energy density are associated with different weight functions. The results are then compared to numerical calculations for the hopping chain, which requires to consider a proper continuum limit of the lattice entanglement Hamiltonian, obtaining a good agreement with the field-theory prediction.
Cite
@article{arxiv.2508.19406,
title = {Entanglement Hamiltonian after a local quench},
author = {Riccarda Bonsignori and Viktor Eisler},
journal= {arXiv preprint arXiv:2508.19406},
year = {2025}
}