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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/2503.15343 |
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| _version_ | 1866917961990668288 |
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| author | Marchenko, Dmitry Sajedi, Maryam Krivenkov, Maxim Khan, Saleem Ayaz Varykhalov, Andrei Fedorov, Alexander Sánchez-Barriga, Jaime Többens, Daniel M. Unold, Thomas Minár, Ján Rader, Oliver |
| author_facet | Marchenko, Dmitry Sajedi, Maryam Krivenkov, Maxim Khan, Saleem Ayaz Varykhalov, Andrei Fedorov, Alexander Sánchez-Barriga, Jaime Többens, Daniel M. Unold, Thomas Minár, Ján Rader, Oliver |
| contents | Halide perovskites are a promising class of materials for optoelectronic and photovoltaic applications, exhibiting high power conversion efficiency due to strong light absorption and long carrier diffusion lengths. While various aspects of their crystal and electronic structure have been studied, we identify a fundamental property previously overlooked that may significantly impact their efficiency. We demonstrate that halide perovskites realize a three-dimensional (3D) Lieb lattice, giving rise to a gapped 3D Dirac cone of spin-1 fermions. This leads to a fivefold reduction in effective mass compared to a conventional cubic structure and suppressed carrier backscattering due to Klein tunneling. Our conclusions are supported by band structure calculations and angle-resolved photoemission spectroscopy from CsPbBr$_3$ and CsSnBr$_3$. In particular, we reveal the transformation of the flat band of the Lieb lattice and the emergence of a dark corridor effect in photoemission from the Dirac cone, which increases as the band gap is decreased from CsPbBr$_3$ to CsSnBr$_3$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_15343 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Halide Perovskites as Spin-1 Dirac Materials Marchenko, Dmitry Sajedi, Maryam Krivenkov, Maxim Khan, Saleem Ayaz Varykhalov, Andrei Fedorov, Alexander Sánchez-Barriga, Jaime Többens, Daniel M. Unold, Thomas Minár, Ján Rader, Oliver Materials Science Halide perovskites are a promising class of materials for optoelectronic and photovoltaic applications, exhibiting high power conversion efficiency due to strong light absorption and long carrier diffusion lengths. While various aspects of their crystal and electronic structure have been studied, we identify a fundamental property previously overlooked that may significantly impact their efficiency. We demonstrate that halide perovskites realize a three-dimensional (3D) Lieb lattice, giving rise to a gapped 3D Dirac cone of spin-1 fermions. This leads to a fivefold reduction in effective mass compared to a conventional cubic structure and suppressed carrier backscattering due to Klein tunneling. Our conclusions are supported by band structure calculations and angle-resolved photoemission spectroscopy from CsPbBr$_3$ and CsSnBr$_3$. In particular, we reveal the transformation of the flat band of the Lieb lattice and the emergence of a dark corridor effect in photoemission from the Dirac cone, which increases as the band gap is decreased from CsPbBr$_3$ to CsSnBr$_3$. |
| title | Halide Perovskites as Spin-1 Dirac Materials |
| topic | Materials Science |
| url | https://arxiv.org/abs/2503.15343 |