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Conduction band structure and ultrafast dynamics of ferroelectric α-GeTe(111)
| Citace: |
KREMER, G.; NICOLAI, LCH.; CHASSOT, F.; MAKLAR, J.; NICHOLSON, CHW.; DIL, JH.; KREMPASKÝ, J.; SPRINGHOLZ, G.; ERNSTORFER, R.; MINÁR, J.; RETTIG, L.; MONNEY, C. Conduction band structure and ultrafast dynamics of ferroelectric ?-GeTe(111). Physical Review B, 2025, roč. 111, č. 23, s. nestránkováno. ISSN 2469-9950.
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| Druh: | ČLÁNEK |
| Jazyk publikace: | eng |
| Anglický název: | Conduction band structure and ultrafast dynamics of ferroelectric ?-GeTe(111) |
| Rok vydání: | 2025 |
| Autoři: | Geoffroy Kremer , Laurent Christophe Nicolai Doktor , Frédéric Chassot , Julian Maklar , Christopher W. Nicholson , J. Hugo Dil , Juraj Krempaský , Gunther Springholz , Ralph Ernstorfer , prof. Dr. Jan Minár , Laurenz Rettig , Claude Monney |
| Abstrakt EN: | alpha-GeTe(111) is a noncentrosymmetric 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 alpha-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 alpha-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. |
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