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arXiv · 1511.08010

Topological phases of lattice bosons with a dynamical gauge field

David Raventós·Tobias Graß·Bruno Juliá-Díaz·Luis Santos·Maciej Lewenstein
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Abstract

Optical lattices with a complex-valued tunnelling term have become a standard way of studying gauge-field physics with cold atoms. If the complex phase of the tunnelling is made density-dependent, such 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 non-trivial phases.

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David Raventós, Tobias Graß, Bruno Juliá-Díaz, Luis Santos, Maciej Lewenstein. 2015-11-25. Topological phases of lattice bosons with a dynamical gauge field. https://doi.org/10.1103/physreva.93.033605

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