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Spin–orbit splitting in the valence bands of 1<i>T</i>-TaS<sub>2</sub> and 1<i>T</i>-TaSe<sub>2</sub>
Auteur(s)
Clerc, F.
Bovet, M.
Berger, H.
Despont, Laurent
Koitzsch, C.
Gallus, O
Patthey, L
Shi, M.
Krempasky, J.
Garnier, Michael Bernard Gunnar
Aebi, Philipp
Date de parution
2004
In
Journal of Physics : Condensed Matter, Institute of Physics (IOP), 2004/16//3271-3278
Résumé
We perform angle-resolved photoemission spectroscopy on 1<i>T</i>-TaS<sub>2</sub> and 1<i>T</i>-TaSe<sub>2</sub> using synchrotron radiation. We observe a characteristic splitting of the chalcogen p-derived valence bands along high symmetry directions. Density functional theory calculation and group theory strongly suggest that this splitting is due to spin–orbit interaction along one direction, and to symmetry along the other direction. We note that, according to the Kramers degeneracy, the spin–orbit interaction leaves every state doubly degenerate. Furthermore, this study allows us to identify a mixing between bands with Ta 5d and Se 4p character, possibly relevant for the different temperature behaviours of the two compounds.
Identifiants
Type de publication
journal article
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