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Polaron Masses in CH_{3}NH_{3}PbX_{3} Perovskites Determined by Landau Level Spectroscopy in Low Magnetic Fields
Yasuhiro Yamada1, Hirofumi Mino2, Takuya Kawahara3
1Graduate School of Science, Chiba University, Inage, Chiba 263-8522, Japan.
Abstract:
We investigate the electron-phonon coupling in CH_{3}NH_{3}PbX_{3} lead halide perovskites through the observation of Landau levels and high-order excitons at weak magnetic fields, where the cyclotron energy is significantly smaller than the longitudinal optical phonon energy. The reduced masses of the carriers and the exciton binding energies obtained from these data are clearly influenced by polaron formation. We analyze the field-dependent polaronic and excitonic properties, and show that they can be quantitatively reproduced by the Fröhlich large polaron model.
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