Abstract

We demonstrated a scheme to differentiate the high-harmonic generation (HHG) originating from the surface states and bulk states of the topological insulator Bi₂Se₃. By adopting two-color mid-infrared laser fields on Bi₂Se₃, we found that the nonlinear response sensitively depends on the relative phase of the driving fields. The even harmonics arise from the surface states with a clear signature, whose modulation period equals the cycle of the second-harmonic generation (SHG) field. We reveal that the weak SHG perturbs the nontrivial dipole phase of the electron-hole pair in surface states, and thus leads to the modulation of HHG. It provides a means to manipulate the ultrafast dynamics in surface states through adopting a weak perturbing laser field.

© 2023 Chinese Laser Press

Optically tunable spin texture of the surface state for Bi₂Se₃ and SmB₆ topological insulators

Y. F. Peng, C. M. Dai, H. Z. Shen, and X. X. Yi
Opt. Express 26(15) 18906-18919 (2018)

High-repetition-rate Q-switched fiber laser with high quality topological insulator Bi₂Se₃ film

Zhenhua Yu, Yanrong Song, Jinrong Tian, Zhiyuan Dou, Heyang Guoyu, Kexuan Li, Hongwei Li, and Xinping Zhang
Opt. Express 22(10) 11508-11515 (2014)

Femtosecond harmonic mode-locking of a fiber laser based on a bulk-structured Bi₂Te₃ topological insulator

Junsu Lee, Joonhoi Koo, Young Min Jhon, and Ju Han Lee
Opt. Express 23(5) 6359-6369 (2015)

Wavelength-tunable picosecond soliton fiber laser with Topological Insulator: Bi₂Se₃ as a mode locker

Chujun Zhao, Yanhong Zou, Yu Chen, Zhiteng Wang, Shunbin Lu, Han Zhang, Shuangchun Wen, and Dingyuan Tang
Opt. Express 20(25) 27888-27895 (2012)

Mode-locked ytterbium-doped fiber laser based on topological insulator: Bi₂Se₃

Zhiyuan Dou, Yanrong Song, Jinrong Tian, Jinghui Liu, Zhenhua Yu, and Xiaohui Fang
Opt. Express 22(20) 24055-24061 (2014)