Terahertz Kerr effect in a methylammonium lead bromide perovskite crystal

Article

关键词: FEMTOSECOND OPTICAL KERR;    DYNAMICS;    LIQUIDS;    PHASE;    WATER;    REORIENTATION;    CH3NH3PBI3;    DISORDER;    CARRIERS;    ORIGIN;   

DOI  :  10.1103/PhysRevB.105.174304

来源: SCIE

【 摘 要 】

We have observed short-lived optical birefringence in a CH3NH3PbBr3 single crystal induced by a powerful nearly single-cycle terahertz pulse. Apart from the instantaneous contribution that follows the profile of the squared pump electric field, the recorded anisotropy signal contains an exponential component decaying in similar to 350 fs, underdamped oscillations at the frequency of similar to 0.16 THz and an intermediate picosecond relaxation process with a Gaussian tail. We associate these three nontrivial features with, respectively, Kerr effect in the inorganic lattice, terahertz-induced transient alignment of CH3NH3+ cations, and their coherent rotation excited by the terahertz pulse in a Raman process.

【 授权许可】

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