Seeing Topological Order in Time-of-Flight Measurements

E. Alba, X. Fernandez-Gonzalvo, J. Mur-Petit, J. K. Pachos, J. J. Garcia-Ripoll
2011 Physical Review Letters  
In this work we provide a general methodology to directly measure topological order in cold atom systems. As an application we propose the realisation 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.
doi:10.1103/physrevlett.107.235301 pmid:22182096 fatcat:or3hqegfgvfvxkea7f7puuuwl4