The highly prestigious international journal Physical Review Letters has http://prl.aps.org/abstract/PRL/v106/i15/e153601 and a corresponding reference titled:
Mimicking Interacting Relativistic Theories with Stationary Pulses of Light in the following website that highlights new scientific findings: http://hepinfo.net/node/110991. It is worth mentioning that the aforementioned work was presented in an invited talk titled "Quantum simulations with photons: The path from Mott transitions to interacting relativistic theories with light" in the Yang Institute of Theoretical Physics in New York: http://insti.physics.sunysb.edu/itp/www/component/gcalendar/day/calendars/1#year=2013&month=03&day=25