Topological phases of lattice bosons with a dynamical gauge field
arXiv:1511.08010 · doi:10.1103/PhysRevA.93.033605
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.
9 pages, 8 figures
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- Review on novel methods for lattice gauge theories
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- Enhanced repulsively bound atom pairs in topological optical lattice ladders
- Chaotic dynamics of Bose-Einstein condensate in a density-dependent gauge field
- Hubbard models and state preparation in an optical Lieb lattice