title: Identifying the order of a quantum phase transition by means of Wehrl entropy in phase space.
abstract: We propose a method to identify the order of a quantum phase transition by using area measures of the ground state in phase space. We illustrate our proposal by analyzing the well known example of the quantum cusp and four different paradigmatic boson models: Dicke, Lipkin-Meshkov-Glick, interacting boson model, and vibron model.
authors.affiliation: Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Apartado Postal 70-543, 04510 Distrito Federal, Mexico.
authors.forename: Octavio
authors.initials: O
authors.lastname: Castaños
authors.affiliation: Departamento de Matemática Aplicada, Facultad de Ciencias, Universidad de Granada, Fuentenueva s/n, 18071 Granada, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Calixto
authors.affiliation: Departamento de Física Aplicada, Facultad de Ciencias Experimentales, Universidad de Huelva, Campus del Carmen, Avenida de las Fuerzas Armadas s/n, 21071 Huelva, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Pérez-Bernal
authors.affiliation: Departamento de Física Atómica, Molecular y Nuclear and Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, Fuentenueva s/n, 18071 Granada, Spain.
authors.forename: Elvira
authors.initials: E
authors.lastname: Romera