[9p-C309-1~13] 12.8 Specific theme: Photoelectric Properties, Structural Controls and Device of Perovskites Materials

4:00 PM - 4:15 PM JST(7:00 AM - 7:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9p-C309-8] Single-domain engineering and SHG response in ferroelectric halide perovskite CsGeI₃ thin films

〇Asahi Yamada¹, Takuya Takashiro¹, Naoki Ogawa², Yoshinori Tokura^2,3,4, Masao Nakamura^1,2 (1.Tohoku Univ., 2.RIKEN CEMS, 3.Univ. of Tokyo, 4.Tokyo College)

Keywords:

Halide perovskite,Second Harmonic Generation,Epitaxial thin films

Cesium Germanium Iodide (CsGeI₃) is a ferroelectric perovskite material that exhibits giant spontaneous polarization along the <111> direction of its pseudocubic structure, giving rise to a large nonlinear optical response. However, it has been difficult to control the polarization axis so far. In this presentation, we report the successful growth of single-domain CsGeI₃ (111) thin films with out-of-plane polarization by using molecular beam epitaxy and the observation of the strong second-harmonic generation associated with the aligned polarization.