https://scholars.lib.ntu.edu.tw/handle/123456789/626669
標題: | Photovoltaic effect by soft phonon excitation | 作者: | Okamura, Yoshihiro Morimoto, Takahiro Ogawa, Naoki Kaneko, Yoshio GUANG-YU GUO Nakamura, Masao Kawasaki, Masashi Nagaosa, Naoto Tokura, Yoshinori Takahashi, Youtarou |
關鍵字: | bulk photovoltaic effect; ferroelectrics; shift current; terahertz optics; Physics - Strongly Correlated Electrons; Physics - Strongly Correlated Electrons | 公開日期: | 5-四月-2022 | 出版社: | NATL ACAD SCIENCES | 卷: | 119 | 期: | 14 | 來源出版物: | Proceedings of the National Academy of Sciences of the United States of America | 摘要: | SignificanceThe quantum-mechanical geometric phase of electrons provides various phenomena such as the dissipationless photocurrent generation through the shift current mechanism. So far, the photocurrent generations are limited to above or near the band-gap photon energy, which contradicts the increasing demand of the low-energy photonic functionality. We demonstrate the photocurrent through the optical phonon excitations in ferroelectric BaTiO3 by using the terahertz light with photon energy far below the band gap. This photocurrent without electron-hole pair generation is never explained by the semiclassical treatment of electrons and only arises from the quantum-mechanical geometric phase. The observed photon-to-current conversion efficiency is as large as that for electronic excitation, which can be well accounted for by newly developed theoretical formulation of shift current. |
描述: | 25 pages, 8 figures |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/626669 | ISSN: | 0027-8424 | DOI: | 10.1073/pnas.2122313119 |
顯示於: | 物理學系 |
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