[10a-A24-1~11] 12.8 Specific theme: Photoelectric Properties, Structural Controls and Device of Perovskites Materials

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)English Presentation

[10a-A24-1] Sideband structures in bulk halide perovskite CsPbBr3 revealed by resonant sum-frequency generation excitation

〇Henrik Boedker Lassen^1,2, Shinya Takahashi², Toshiharu Teranishi³, Yoshihiko Kanemitsu^1,3, Yasuhiro Yamada⁴, Koichiro Tanaka^1,2 (1.RIKEN RAP, 2.Dept. of Physics, Kyoto Univ., 3.ICR, Kyoto Univ., 4.Dept. of Physics, Chiba Univ.)

Keywords:

Perovskite,Spectroscopy,Nonlinear Optics

We report the observation of a pronounced sideband structure in bulk CsPbBr3 under resonant sum-frequency generation (SFG) excitation. The emission spectrum is dominated by a bound-exciton peak accompanied by equally spaced sidebands with an energy separation of approximately 3 meV, consistent with a low-energy phonon mode. A Huang-Rhys analysis yields a factor of (S = 0.28), indicative of weak exciton-phonon coupling.