Ultrafast Photo-induced Phase Change in SnSe
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2022
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| _version_ | 1866917585887428608 |
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| author | Dringoli, Benjamin J. Sutton, Mark Luo, Zhongzhen Kanatzidis, Mercouri G. Cooke, David G. |
| author_facet | Dringoli, Benjamin J. Sutton, Mark Luo, Zhongzhen Kanatzidis, Mercouri G. Cooke, David G. |
| contents | Time-resolved multi-terahertz (THz) spectroscopy is used to observe an ultrafast, non-thermal electronic phase change in SnSe driven by interband photoexcitation with 1.55 eV pump photons. The transient THz photoconductivity spectrum is found to be Lorentzian-like, indicating charge localization and phase segregation. The rise of photoconductivity is bimodal in nature, with both a fast and slow component due to excitation into multiple bands and subsequent intervalley scattering. The THz conductivity magnitude, dynamics, and spectra show a drastic change in character at a critical excitation fluence of approximately 6 mJ/cm^2 due to a photo-induced phase segregation and a macroscopic collapse of the band gap. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_12498 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Ultrafast Photo-induced Phase Change in SnSe Dringoli, Benjamin J. Sutton, Mark Luo, Zhongzhen Kanatzidis, Mercouri G. Cooke, David G. Materials Science Other Condensed Matter Time-resolved multi-terahertz (THz) spectroscopy is used to observe an ultrafast, non-thermal electronic phase change in SnSe driven by interband photoexcitation with 1.55 eV pump photons. The transient THz photoconductivity spectrum is found to be Lorentzian-like, indicating charge localization and phase segregation. The rise of photoconductivity is bimodal in nature, with both a fast and slow component due to excitation into multiple bands and subsequent intervalley scattering. The THz conductivity magnitude, dynamics, and spectra show a drastic change in character at a critical excitation fluence of approximately 6 mJ/cm^2 due to a photo-induced phase segregation and a macroscopic collapse of the band gap. |
| title | Ultrafast Photo-induced Phase Change in SnSe |
| topic | Materials Science Other Condensed Matter |
| url | https://arxiv.org/abs/2212.12498 |