title: Fluctuations of the heat exchanged between two quantum spin chains.
abstract: The statistics of the heat exchanged between two quantum XX spin chains prepared at different temperatures is studied within the assumption of weak coupling. This provides simple formulas for the average heat and its corresponding characteristic function, from which the probability distribution may be computed numerically. These formulas are valid for arbitrary sizes and therefore allow us to analyze the role of the thermodynamic limit in this nonequilibrium setting. It is found that all thermodynamic quantities are extremely sensitive to the quantum phase transition of the XX chain.
authors.affiliation: Universidade Federal do ABC, 09210-580 Santo André, Brazil.
authors.forename: Gabriel T
authors.initials: GT
authors.lastname: Landi
authors.affiliation: Institut Jean Lamour, Department P2M, Groupe de Physique Statistique, Université de Lorraine, CNRS, B.P. 70239, F-54506 Vandoeuvre les Nancy Cedex, France.
authors.forename: Dragi
authors.initials: D
authors.lastname: Karevski