Chinese Optics Letters, Volume. 21, Issue 4, 043801(2023)
Distinguishing high-harmonic generation from surface and bulk states in topological insulator Bi2Se3
Fig. 1. Experimental setup. The fundamental and SHG are linearly polarized in s-polarization direction. The mirror plane of Bi2Se3 is rotated to be parallel to the polarization of the pump field.
Fig. 2. HHG spectrum with and without the SHG, respectively; the intensity of the fundamental is 77 GW/cm2; gray line, the SHG intensity is 0; green line, the SHG intensity is 0.025 GW/cm2; ϕ = π. The small peak at 1.48 eV is the second-order diffraction of H9 from the grating-based spectrometer.
Fig. 3. Harmonic yield versus the phase delay of two-color laser fields. (a) Modulation of H4 for the SHG intensity of 0.025 GW/cm2 (blue square and line) and 1.2 GW/cm2 (orange square and line); (b), (c) Modulation of H5 (b) and H6 (c) with the same experimental condition as (a).
Fig. 4. Calculated high-harmonic spectra. (a) HHG from the surface states with and without the SHG; blue line, harmonic spectrum without the SHG; orange line, harmonic spectrum for the SHG intensity equal to 40 MW/cm2 and ϕ = 0.6π. (b) HHG from the bulk states with and without the SHG; blue line, harmonic spectrum without the SHG; orange line, harmonic spectrum for the SHG intensity equal to 40 MW/cm2 and ϕ = 0.6π.
Fig. 5. High-harmonic yield modulated with the phase delay of two-color laser fields. (a), (b) Modulation of H4 (a) and H5 (b) from the surface states, for the SHG intensity of 4 MW/cm2 (red line) and 40 MW/cm2 (blue line), respectively; (c), (d) modulation of H4 (c) and H5 (d) from the bulk states, for the SHG intensity of 4 MW/cm2 (red line), 40 MW/cm2 (blue line), and 400 MW/cm2 (purple line), respectively.
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Yang Jiang, Ya Bai, Zeyi Ye, Na Li, Candong Liu, Peng Liu, "Distinguishing high-harmonic generation from surface and bulk states in topological insulator Bi2Se3," Chin. Opt. Lett. 21, 043801 (2023)
Category: Light-matter Interaction
Received: Aug. 21, 2022
Accepted: Nov. 25, 2022
Published Online: Apr. 10, 2023
The Author Email: Ya Bai (pipbear@siom.ac.cn)