Terahertz Kerr effect in a methylammonium lead bromide perovskite crystal

We have observed short-lived optical birefringence in a CH\(_3\)NH\(_3\)PbBr\(_3\) 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...

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Bibliographic Details
Published inarXiv.org
Main Authors Melnikov, A A, Anikeeva, V E, Semenova, O I, Chekalin, S V
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 08.05.2022
Subjects
Anisotropy
Birefringence
Electric fields
Gaussian process
Kerr effects
Perovskites
Physics - Applied Physics
Physics - Materials Science
Single crystals
Terahertz frequencies
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Summary:We have observed short-lived optical birefringence in a CH\(_3\)NH\(_3\)PbBr\(_3\) 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 \(\sim\) 350 fs, underdamped oscillations at the frequency of \(\sim\) 0.16 THz and an intermediate picosecond relaxation process with a Gaussian tail. We associate these three non-trivial features with, respectively, Kerr effect in the inorganic lattice, terahertz-induced transient alignment of CH\(_3\)NH\(_3^+\) cations, and their coherent rotation excited by the terahertz pulse in a Raman process.
ISSN:2331-8422
DOI:10.48550/arxiv.2110.08234