Raventós i Ribera, DavidGraß, TobiasJuliá-Díaz, BrunoSantos, LuisLewenstein, Maciej2016-03-112016-03-112016-03-021050-2947https://hdl.handle.net/2445/96403Optical lattices with a complex-valued tunneling term have become a standard way of studying gauge-field physics with cold atoms. If the complex phase of the tunneling is made density dependent, such a system features even a self-interacting or dynamical magnetic field. In this paper we study the scenario of a few bosons in either a static or a dynamical gauge field by means of exact diagonalization. The topological structures are identified computing their Chern number. Upon decreasing the atom-atom contact interaction, the effect of the dynamical gauge field is enhanced, giving rise to a phase transition between two topologically nontrivial phases.8 p.application/pdfeng(c) American Physical Society, 2016OptoelectrònicaÒptica quànticaOptoelectronicsQuantum opticsinfo:eu-repo/semantics/article6577852016-03-11info:eu-repo/semantics/openAccess