Free fermions with a localized source. (22nd November 2019)

• Record Type: Journal Article
• Authors: Krapivsky, P L; Mallick, Kirone; Sels, Dries
• Is Part Of: Journal of statistical mechanics. (2019:Nov.)
• Publication Date: 2019-11-22
• Subjects: 2 -- 1; Statistical mechanics -- Periodicals; Mechanics -- Statistical methods -- Periodicals; 530.1305
• DOI: 10.1088/1742-5468/ab4e8e
• Languages: English
• ISSNs: 1742-5468

Abstract

Abstract: We study an open quantum system of free fermions on an infinite lattice coupled to a localized particle source. In the long time limit, the total number of fermions in the system increases linearly with growth rate dependent on the lattice geometry and dimensionality. We express the growth rate in terms of lattice Green functions and derive explicit formulae in one dimension and for the square lattice. The interplay between the dynamics and the coupling to the environment leads, in contrast to classical systems, to a non-monotonic dependence of the particle growth rate on the input rate. We show that for all lattices the particle growth rate is inversely proportional to the input rate when the latter becomes large. This is a manifestation of the quantum Zeno effect.