Volume 84, Number 6, December 2008
Article Number 60004
Number of page(s) 5
Section General
Published online 12 January 2009
EPL, 84 (2008) 60004
DOI: 10.1209/0295-5075/84/60004

Extended Haldane's model and its simulation with ultracold atoms

Fuxiang Li, L. Sheng and D. Y. Xing

National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, China

received 29 September 2008; accepted in final form 12 November 2008; published December 2008
published online 12 January 2009

Haldane's model is extended to a square lattice related close to the so-called d + id state, in which the on-site energy is staggered and the next-nearest-neighbor hopping is anisotropic. From the phase diagram obtained, two types of phases are found, i.e., the normal insulator with Chern number C = 0 and the Hall insulator with C = $\pm$ 1. We propose a way of simulating this model with cold atoms in an optical lattice. By measuring the atomic density profile, one can detect this phase diagram.

05.30.Fk - Fermion systems and electron gas.
73.43.-f - Quantum Hall effects.
42.50.Wk - Mechanical effects of light on material media, microstructures and particles.

© EPLA 2008