title: Seeing topological order in time-of-flight measurements.
abstract: In this Letter, we provide a general methodology to directly measure topological order in cold atom systems. As an application, we propose the realization of a characteristic topological model, introduced by Haldane, using optical lattices loaded with fermionic atoms in two internal states. We demonstrate that time-of-flight measurements directly reveal the topological order of the system in the form of momentum-space Skyrmions.
authors.affiliation: Instituto de Física Fundamental, IFF-CSIC, Calle Serrano 113b, Madrid 28006, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Alba
authors.forename: X
authors.initials: X
authors.lastname: Fernandez-Gonzalvo
authors.forename: J
authors.initials: J
authors.lastname: Mur-Petit
authors.forename: J K
authors.initials: JK
authors.lastname: Pachos
authors.forename: J J
authors.initials: JJ
authors.lastname: Garcia-Ripoll