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Title: Entanglement entropy in low-energy field theories at a finite chemical potential
Author: Morera Navarro, Ivan
Frerot, Iréneé
Polls Martí, Artur
Juliá-Díaz, Bruno
Keywords: Gravetat quàntica
Quantum gravity
Issue Date: 2-Jul-2020
Publisher: American Physical Society
Abstract: We investigate the leading area-law contribution to entanglement entropy in a system described by a general Lagrangian with O(2) symmetry containing first- and second-order time derivatives, namely, breaking the Lorentz invariance. We establish a connection between the Higgs gap present in a symmetry-broken phase and the area-law term for the entanglement entropy in the general nonrelativistic case. Our predictions for the entanglement entropy and correlation length are successfully compared to numerical results in two paradigmatic systems: the Mott insulator to the superfluid transition for ultracold lattice bosons and the ground state of ferrimagnetic systems.
Note: Reproducció del document publicat a:
It is part of: Physical Review Research, 2020, vol. 2, num. 3, p. 033016
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ISSN: 2643-1564
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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