Mechanistic Insights into Non-Adiabatic Interband Transitions on a Semiconductor Surface Induced by Hydrogen Atom Collisions
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arXiv
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| Format: | Preprint |
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2024
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| author | Zhu, Lingjun Zheng, Qijing Wang, Yingqi Krüger, Kerstin Wodtke, Alec M. Bünermann, Oliver Zhao, Jin Guo, Hua Jiang, Bin |
| author_facet | Zhu, Lingjun Zheng, Qijing Wang, Yingqi Krüger, Kerstin Wodtke, Alec M. Bünermann, Oliver Zhao, Jin Guo, Hua Jiang, Bin |
| contents | To understand the recently observed mysterious non-adiabatic energy transfer for hyperthermal H atom scattering from a semiconductor surface, Ge(111)c(2*8), we present a mixed quantum-classical non-adiabatic molecular dynamics model based on time-dependent evolution of Kohn-Sham orbitals and a classical path approximation. Our results suggest that facile non-adiabatic transitions occur selectively at the rest atom site, featuring excitation of valance band electrons to the conduction band, but not at the adatom site. This drastic site specificity can be attributed to the changes of the local band structure upon energetic H collisions at different surface sites, leading to transient near-degeneracies and significant couplings between occupied and unoccupied orbitals at the rest atom, but not at the adatom. These insights shed valuable light on the collisional induced non-adiabatic dynamics at semiconductor surfaces. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_13361 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Mechanistic Insights into Non-Adiabatic Interband Transitions on a Semiconductor Surface Induced by Hydrogen Atom Collisions Zhu, Lingjun Zheng, Qijing Wang, Yingqi Krüger, Kerstin Wodtke, Alec M. Bünermann, Oliver Zhao, Jin Guo, Hua Jiang, Bin Chemical Physics To understand the recently observed mysterious non-adiabatic energy transfer for hyperthermal H atom scattering from a semiconductor surface, Ge(111)c(2*8), we present a mixed quantum-classical non-adiabatic molecular dynamics model based on time-dependent evolution of Kohn-Sham orbitals and a classical path approximation. Our results suggest that facile non-adiabatic transitions occur selectively at the rest atom site, featuring excitation of valance band electrons to the conduction band, but not at the adatom site. This drastic site specificity can be attributed to the changes of the local band structure upon energetic H collisions at different surface sites, leading to transient near-degeneracies and significant couplings between occupied and unoccupied orbitals at the rest atom, but not at the adatom. These insights shed valuable light on the collisional induced non-adiabatic dynamics at semiconductor surfaces. |
| title | Mechanistic Insights into Non-Adiabatic Interband Transitions on a Semiconductor Surface Induced by Hydrogen Atom Collisions |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2405.13361 |