Strongly enhanced shift current at exciton resonances in a noncentrosymmetric wide-gap semiconductor
Masao Nakamura, Yang-Hao Chan, Takahiro Yasunami, Yi-Shiuan Huang, Guang-Yu Guo, Yajian Hu, Naoki Ogawa, Yiling Chiew, Xiuzhen Yu, Takahiro Morimoto, Naoto Nagaosa, Yoshinori Tokura, Masashi Kawasaki · 2024
Read Strongly enhanced shift current at exciton resonances in a noncentrosymmetric wide-gap semiconductor by Masao Nakamura, Yang-Hao Chan, Takahiro Yasunami, Yi-Shiuan Huang, Guang-Yu Guo, Yajian Hu, Naoki Ogawa, Yiling Chiew, Xiuzhen Yu, Takahiro Morimoto, Naoto Nagaosa, Yoshinori Tokura, Masashi Kawasaki (2024) in the Tower of Babel, a free online library of public-domain works preserved in clean, searchable text. No sign-up. The full text is served as a plain-text file at a predictable URL, where text is present: https://antarctic-labs.com/tower-of-babel/pmc-11569220.txt.
Description
Masao Nakamura and colleagues demonstrate that excitons can drive photocurrent directly in a copper iodide film, in a study from twenty twenty-four. Excitons absorb light strongly but carry no charge. Conventional solar processes must split them before any current flows. A nonlinear interaction offers another route.
The film's photocurrent surged at exciton resonance energies, even below the bandgap. Polarization tests identified it as shift current. That current arises from a geometric phase change during optical transitions. It exceeded the above-bandgap current and pointed the opposite way. Calculations tied its sign and size to strain in the film. The study reveals excitons as amplifiers of nonlinear optical response. Strain becomes a dial for manipulating the effect.
Catalog record
| CREATOR | Masao Nakamura, Yang-Hao Chan, Takahiro Yasunami, Yi-Shiuan Huang, Guang-Yu Guo, Yajian Hu, Naoki Ogawa, Yiling Chiew, Xiuzhen Yu, Takahiro Morimoto, Naoto Nagaosa, Yoshinori Tokura, Masashi Kawasaki |
|---|---|
| YEAR | 2024 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 39 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |