摘要
We demonstrated a scheme to differentiate the high-harmonic generation[HHG)originating from the surface states and bulk states of the topological insulator Bi_(2)Se_(3).By adopting two-color mid-infrared laser fields on Bi_(2)Se_(3),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.
作者
江阳
白亚
叶泽奕
李娜
刘灿东
刘鹏
Yang Jiang;Ya Bai;Zeyi Ye;Na Li;Candong Liu;Peng Liu(State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;School of Physics Science and Engineering,Tongji University,Shanghai 200092,China;Physics and Electronic Engineering Department,Xinxiang University,Xinxiang 453003,China)
基金
supported by the National Natural Science Foundation of China(Nos.12174412 and 11874373)
the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2021241)
the Scientific Instrument Developing Project of the Chinese Academy of Sciences(No.YJKYYQ20180023)
the Natural Science Foundation of Henan Province(No.202300410017)
the Xinxiang University Doctor Initial Research Program(No.1366020150).
