Optically engineering the topological properties in a two-dimensional square lattice
1 School of Science, Jiangnan University - Wuxi 214122, China
2 Department of Physics, Texas A&M University - College Station, TX 77843-4242, USA
Received: 7 May 2012
Accepted: 26 July 2012
We investigate the possibility of optically manipulating the topological phase transition in a two-dimensional square lattice with staggered on-site energy and anisotropy next-nearest-neighbor hopping integral (an extended Haldane model), from the trivial insulator phase to the Chern insulator phase. Under the circular-polarization laser field, we calculate the energy spectrum of the system and obtain the Chern number phase diagram. The implications of our results are discussed.
PACS: 73.43.Nq – Quantum phase transitions / 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
© EPLA, 2012