Interferometric detection of Chern numbers of Haldane model on bosonic optical lattices
Science School, Guangdong Ocean University - Zhanjiang 524088, China and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials and School of Physics and Telecommunication Engineering, South China Normal University - Guangzhou 510006, China
Received: 14 August 2015
Accepted: 9 November 2015
Topological states of matter emerge as a new type of quantum phases, which can be distinguished by their associated topological invariants, e.g., Chern numbers. Currently, there has been increasing interest toward the physical detection of the new predicted topological phases. Here, we propose an interferometric approach to directly measure the Chern number of the topological Haldane model in bosonic optical lattices via detecting the associated Zak phases. We show that this interferometric approach can distinguish Zak phases of from 0 in the first Brillouin zone, and thus it provides a new tool to directly detect the Chern number of topological systems. In addition, we demonstrate that this method is feasible under realistic experimental conditions and may generalize to detect topological systems with higher Chern numbers.
PACS: 67.85.-d – Ultracold gases, trapped gases / 03.65.Vf – Phases: geometric; dynamic or topological / 03.75.Dg – Atom and neutron interferometry
© EPLA, 2015