Sublogarithmic behaviour of the entanglement entropy in fermionic chains. (26th September 2019)

• Record Type: Journal Article
• Authors: Ares, Filiberto; Esteve, José G; Falceto, Fernando; Zimborás, Zoltán
• Is Part Of: Journal of statistical mechanics. (2019:Sep.)
• Publication Date: 2019-09-26
• Subjects: 2 -- 1; Statistical mechanics -- Periodicals; Mechanics -- Statistical methods -- Periodicals; 530.1305
• DOI: 10.1088/1742-5468/ab38b6
• Languages: English
• ISSNs: 1742-5468

Abstract

Abstract: In this paper, we discuss the possibility of unexplored behaviours for the entanglement entropy in extended quantum systems. Namely, we study the Rényi entanglement entropy for the ground state of long-range Kitaev chains with slow decaying couplings. We obtain that, under some circumstances, the entropy grows sublogarithmically with the length of the subsystem. Our result is based on the asymptotic behaviour of a new class of Toeplitz determinants whose symbol does not lie within the application domain of the Strong Szegő theorem or the Fisher–Hartwig conjecture.