1. Ultrafast spectroscopy of shift-current in ferroelectric semiconductor Sn2P2S6.
- Author
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Sotome, M., Nakamura, M., Fujioka, J., Ogino, M., Kaneko, Y., Morimoto, T., Zhang, Y., Kawasaki, M., Nagaosa, N., Tokura, Y., and Ogawa, N.
- Subjects
FERROELECTRIC semiconductors ,PHOTOCURRENTS ,PHOTOEXCITATION ,SUBMILLIMETER waves ,EMISSION spectroscopy - Abstract
We report sub-picosecond photocarrier dynamics observed via emitted terahertz waves in a ferroelectric semiconductor Sn
2 P2 S6 . Excitation photon energy, intensity and polarization dependences of the photocarrier dynamics testify that the ultrafast photocurrent originates from the shift-current under interband excitation. The photocurrent excitation spectrum shows a quantitative agreement with that derived from first-principles calculations with the Berry connection integrated, showing the shift-current to be a sensitive feature in ferroelectrics. The terahertz emission spectroscopy is a powerful tool to identify the intricate carrier dynamics under pulsed photoexcitation. [ABSTRACT FROM AUTHOR]- Published
- 2019
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