Large-scale behaviour of local and entanglement entropy of the free Fermi gas at any temperature

• Published in: arXiv.org
• Main Authors: Leschke, Hajo, Sobolev, Alexander V, Spitzer, Wolfgang
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 27.06.2016
• Subjects: Asymptotic properties; Entanglement; Entropy; Euclidean geometry; Euclidean space; Hilbert space; Mathematics - Mathematical Physics; Operators (mathematics); Physics - Mathematical Physics; Physics - Quantum Physics; Physics - Statistical Mechanics; Temperature
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1501.03412

The leading asymptotic large-scale behaviour of the spatially bipartite entanglement entropy (EE) of the free Fermi gas infinitely extended in multidimensional Euclidean space at zero absolute temperature, T=0, is by now well understood. Here, we present and discuss the first rigorous results for the corresponding EE of thermal equilibrium states at T>0. The leading large-scale term of this thermal EE turns out to be twice the first-order finite-size correction to the infinite-volume thermal entropy (density). Not surprisingly, this correction is just the thermal entropy on the interface of the bipartition. However, it is given by a rather complicated integral derived from a semiclassical trace formula for a certain operator on the underlying one-particle Hilbert space. But in the zero-temperature limit the leading large-scale term of the thermal EE considerably simplifies and displays a ln(1/T)-singularity which one may identify with the known logarithmic enhancement at T=0 of the so-called area-law scaling.