点反射
光致发光
光谱学
光子
自旋电子学
材料科学
凝聚态物理
吸收光谱法
离子键合
带隙
激发
卤化物
吸收(声学)
分子物理学
化学物理
作者
Evan Lafalce,Eric Amerling,Zhi-Gang Yu,Peter C. Sercel,Luisa Whittaker-Brooks,Z. V. Vardeny
标识
DOI:10.1038/s41467-022-28127-9
摘要
The Rashba splitting in hybrid organic-inorganic lead-halide perovskites (HOIP) is particularly promising and yet controversial, due to questions surrounding the presence or absence of inversion symmetry. Here we utilize two-photon absorption spectroscopy to study inversion symmetry breaking in different phases of these materials. This is an all-optical technique to observe and quantify the Rashba effect as it probes the bulk of the materials. In particular, we measure two-photon excitation spectra of the photoluminescence in 2D, 3D, and anionic mixed HOIP crystals, and show that an additional band above, but close to the optical gap is the signature of new two-photon transition channels that originate from the Rashba splitting. The inversion symmetry breaking is believed to arise from ionic impurities that induce local electric fields. The observation of the Rashba splitting in the bulk of HOIP has significant implications for the understanding of their spintronic and optoelectronic device properties.
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