Floquet Topological Insulator in the BHZ Model with the Polarized Optical Field
ZHU Hua-Xin1**, WANG Tong-Tong2, GAO Jin-Song2, LI Shuai1, SUN Ya-Jun1, LIU Gui-Lin1
1School of Science, Jiangnan University, Wuxi 214122 2Key Laboratory of Optical System Advanced Manufacturing Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033
Abstract：Topological phase of newly found matter has aroused wide interests, especially related with the external periodical modulating. With the help of the Floquet theory, we investigate the possibility of externally manipulating the topological property in a HgTe/CdTe quantum well system with the polarized optical field. We give the phase diagram, showing that by modulating the parameters of the polarized optical field, especially the phase, the topological phase transition can be realized in the QW and lead to the so-called Floquet topological insulator. When the optical field is weak, the driven QSH state of QW is robust with the optical field. However, when the optical field is relatively larger, the group velocity of edge states and the gap between the bulk states exhibit certain oscillations. The implications of our results are discussed.
. [J]. 中国物理快报, 2014, 31(03): 30503-030503.
ZHU Hua-Xin, WANG Tong-Tong, GAO Jin-Song, LI Shuai, SUN Ya-Jun, LIU Gui-Lin. Floquet Topological Insulator in the BHZ Model with the Polarized Optical Field. Chin. Phys. Lett., 2014, 31(03): 30503-030503.
2014, Vol. 31 
