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Topological phases of lattice bosons with a dynamical gauge field
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Optical 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.
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RAVENTÓS I RIBERA, David, et al. Topological phases of lattice bosons with a dynamical gauge field. Physical Review A. 2016. Vol. 93, num. 3, pags. 033605-1-033605-8. ISSN 1050-2947. [consulted: 28 of June of 2026]. Available at: https://hdl.handle.net/2445/96403