Impact of spin-orbit splitting on two-photon absorption spectra in a halide perovskite single crystal
Impact of spin-orbit splitting on two-photon absorption spectra in a halide perovskite single crystal
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DOI：
10.1103/physrevb.103.l041201
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发表时间：
2021-01-06
影响因子：
3.7
通讯作者：
Kanemitsu, Yoshihiko
中科院分区：
文献类型：
--
作者：
Ohara, Keiichi;Yamada, Takumi;Kanemitsu, Yoshihiko
金属卤化物钙钛矿由于其优异的光学性能而成为多用途的光子器件材料。本文报道了CH_3NH_3PbBr_3钙钛矿单晶在线偏振和圆偏振激光脉冲作用下的双光子吸收光谱。我们实验确定的自旋轨道分裂能量从TPA的线性圆二色性光谱，并发现更高的能带约0.8 eV以上的带边。从理论分析的实验数据，我们评估的激子结合能和激子约化质量。我们的研究结果提供了卤化物钙钛矿的电子结构和载流子动力学的基本信息。
Metal halide perovskites have emerged as versatile photonic device materials because of their outstanding optical properties. Here, we report the two-photon absorption (TPA) spectra for CH3NH3PbBr3 perovskite single crystals under linearly and circularly polarized laser pulses. We experimentally determined the spin-orbit splitting energy from the TPA linear-circular dichroism spectrum and found the higher-energy band around 0.8 eV above the band edge. From a theoretical analysis of the experimental data, we evaluated the exciton binding energy and the exciton reduced mass. Our findings provide essential information on the electronic structures and carrier dynamics of halide perovskites.