title: Entanglement scaling in the one-dimensional Hubbard model at criticality.
abstract: We derive exact expressions for the local entanglement entropy epsilon in the ground state of the one-dimensional Hubbard model at a quantum phase transition driven by a change in magnetic field h or chemical potential mu. The leading divergences of delta epsilon/delta h and delta epsilon/delta mu are shown to be directly related to those of the zero-temperature spin and charge susceptibilities. Logarithmic corrections to scaling signal a change in the number of local states accessible to the system as it undergoes the transition.
authors.affiliation: Department of Physics, Göteborg University, SE 412 96 Göteborg, Sweden.
authors.forename: Daniel
authors.initials: D
authors.lastname: Larsson
authors.forename: Henrik
authors.initials: H
authors.lastname: Johannesson