Spectral characterization of the Rashba spin-split band in a lead halide perovskite single crystal by photocurrent heterodyne interference spectroscopy
Spectral characterization of the Rashba spin-split band in a lead halide perovskite single crystal by photocurrent heterodyne interference spectroscopy
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DOI：
10.1103/physrevb.103.l081201
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发表时间：
2021-02
影响因子：
3.7
通讯作者：
Y. Ogawa;H. Tahara;Nanako Igarashi;Y. Yamada;Y. Kanemitsu
中科院分区：
文献类型：
--
作者：
Y. Ogawa;H. Tahara;Nanako Igarashi;Y. Yamada;Y. Kanemitsu
利用外差干涉谱研究了钙钛矿型$\mathrm{C}{\mathrm{H}}_{3}\mathrm{N}{\mathrm{H}}_{3}\mathrm{Pb}{\mathrm{Br}}_{3}$单晶的复介电常数谱随温度的变化规律。由于时间域测量不受非相干晶格弛豫的影响，我们能够探测到一个低能量的间接禁带。我们在谱的虚部的$R点的激子跃迁下的能区观察到了两个峰。这些峰的能量对温度的依赖关系不同于直接跃迁激子的能量依赖关系。分裂宽度和峰值强度的变化趋势可以用拉什巴自旋分裂带的假设来解释。
We characterized the temperature dependence of the complex dielectric susceptibility spectrum of a perovskite $\mathrm{C}{\mathrm{H}}_{3}\mathrm{N}{\mathrm{H}}_{3}\mathrm{Pb}{\mathrm{Br}}_{3}$ single crystal by using heterodyne interference spectroscopy. Owing to a time-domain measurement that is not influenced by incoherent lattice relaxations, we were able to detect a low-energy indirect-gap band. We observed two peaks in the energy region below the exciton transition at the $R$ point in the imaginary part of the spectrum. The temperature dependences of the energies of these peaks were different from the dependence of the energy of the direct-transition exciton. The trends of both the splitting width and peak intensities can be explained by assuming a Rashba spin-split band.