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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/2505.04418 |
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| _version_ | 1866908405523808256 |
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| author | Kremer, Geoffroy Nicolaï, Laurent Chassot, Frédéric Maklar, Julian Nicholson, Christopher W. Dil, J. Hugo Krempaský, Juraj Springholz, Gunther Ernstorfer, Ralph Minár, Jan Rettig, Laurenz Monney, Claude |
| author_facet | Kremer, Geoffroy Nicolaï, Laurent Chassot, Frédéric Maklar, Julian Nicholson, Christopher W. Dil, J. Hugo Krempaský, Juraj Springholz, Gunther Ernstorfer, Ralph Minár, Jan Rettig, Laurenz Monney, Claude |
| contents | $α$-GeTe(111) is a non-centrosymmetric ferroelectric (FE) material for which a significative lattice distortion combined with a strong spin-orbit interaction gives rise to giant Rashba split states in the bulk and at the surface, which have been intensively probed in the occupied valence states using static angle-resolved photoemission spectroscopy (ARPES). Nevertheless, its unoccupied conduction band structure remains unexplored, in particular the experimental determination of its electronic band gap across momentum space. Using time-resolved ARPES based on high-repetition rate and extreme ultraviolet femtosecond (fs) laser, we unveil the band structure of $α$-GeTe(111) in the full Brillouin zone, both in the valence and conduction states, as well as the exploration of its out-of-equilibrium dynamics. Our work confirms the semiconducting nature of $α$-GeTe(111) with a 0.85 eV indirect band gap, which provides an upper limit for comparison to density functional theory calculations. We finally reveal the dominant scattering mechanisms of photoexcited carriers during the out-of-equilibrium dynamics under fs light pulses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_04418 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Conduction Band Structure and Ultrafast Dynamics of Ferroelectric $α$-GeTe(111) Kremer, Geoffroy Nicolaï, Laurent Chassot, Frédéric Maklar, Julian Nicholson, Christopher W. Dil, J. Hugo Krempaský, Juraj Springholz, Gunther Ernstorfer, Ralph Minár, Jan Rettig, Laurenz Monney, Claude Materials Science $α$-GeTe(111) is a non-centrosymmetric ferroelectric (FE) material for which a significative lattice distortion combined with a strong spin-orbit interaction gives rise to giant Rashba split states in the bulk and at the surface, which have been intensively probed in the occupied valence states using static angle-resolved photoemission spectroscopy (ARPES). Nevertheless, its unoccupied conduction band structure remains unexplored, in particular the experimental determination of its electronic band gap across momentum space. Using time-resolved ARPES based on high-repetition rate and extreme ultraviolet femtosecond (fs) laser, we unveil the band structure of $α$-GeTe(111) in the full Brillouin zone, both in the valence and conduction states, as well as the exploration of its out-of-equilibrium dynamics. Our work confirms the semiconducting nature of $α$-GeTe(111) with a 0.85 eV indirect band gap, which provides an upper limit for comparison to density functional theory calculations. We finally reveal the dominant scattering mechanisms of photoexcited carriers during the out-of-equilibrium dynamics under fs light pulses. |
| title | Conduction Band Structure and Ultrafast Dynamics of Ferroelectric $α$-GeTe(111) |
| topic | Materials Science |
| url | https://arxiv.org/abs/2505.04418 |