Tuning Second Chern Number in a Four-Dimensional Topological Insulator by High-Frequency Time-Periodic Driving
Zheng-Rong 峥嵘 Liu 刘,
Rui 锐 Chen 陈,
Bin 斌 Zhou 周
Abstract:In recent years, Floquet engineering has attracted considerable attention as a promising approach for tuning topological phase transitions. In this work, we investigate the effects of high-frequency time-periodic driving in a four-dimensional (4D) topological insulator, focusing on topological phase transitions at the off-resonant quasienergy gap. The 4D topological insulator hosts gapless three-dimensional boundary states, characterized by the second Chern number $C_{2}$. We demonstrate that the second Chern … Show more
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