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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.04624 |
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| _version_ | 1866909507649536000 |
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| author | Lu, Zhuocheng Gong, Zhihao Qi, Jingshan Wang, Hua Chang, Kai |
| author_facet | Lu, Zhuocheng Gong, Zhihao Qi, Jingshan Wang, Hua Chang, Kai |
| contents | The shift current photovoltaic effect is conventionally understood as the real-space displacement of a wave packet induced by photoexcitation. However, this interpretation becomes insufficient in flat-band systems, where quasiparticles are too massive to accelerate in real space under the optical electric field. Here, we developed a physically consistent method to decompose the shift current into real-space and momentum-space components. A surprising pure momentum-space shift current is found theoretically in flat-band Mott insulator Nb$_3$X$_8$ (X = Cl, Br, I) monolayers. This work underscores that significant shift current responses can emerge even in systems with minimal interband polarization differences, highlighting the potential for exploring novel bulk photovoltaic effects in flat-band Mott insulators. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_04624 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pure momentum-shift bulk photovoltaic effect in ferroelectric flat-band Mott insulators Lu, Zhuocheng Gong, Zhihao Qi, Jingshan Wang, Hua Chang, Kai Materials Science The shift current photovoltaic effect is conventionally understood as the real-space displacement of a wave packet induced by photoexcitation. However, this interpretation becomes insufficient in flat-band systems, where quasiparticles are too massive to accelerate in real space under the optical electric field. Here, we developed a physically consistent method to decompose the shift current into real-space and momentum-space components. A surprising pure momentum-space shift current is found theoretically in flat-band Mott insulator Nb$_3$X$_8$ (X = Cl, Br, I) monolayers. This work underscores that significant shift current responses can emerge even in systems with minimal interband polarization differences, highlighting the potential for exploring novel bulk photovoltaic effects in flat-band Mott insulators. |
| title | Pure momentum-shift bulk photovoltaic effect in ferroelectric flat-band Mott insulators |
| topic | Materials Science |
| url | https://arxiv.org/abs/2502.04624 |