Faculté des sciences

Spin–orbit splitting in the valence bands of 1T-TaS2 and 1T-TaSe2

Clerc, F. ; Bovet, M. ; Berger, H. ; Despont, Laurent ; Koitzsch, C. ; Gallus, O ; Patthey, L ; Shi, M. ; Krempasky, J. ; Garnier, Michael Bernard Gunnar ; Aebi, Philipp

In: Journal of Physics : Condensed Matter, 2004, vol. 16, p. 3271-3278

We perform angle-resolved photoemission spectroscopy on 1T-TaS2 and 1T-TaSe2 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... Plus

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    Summary
    We perform angle-resolved photoemission spectroscopy on 1T-TaS2 and 1T-TaSe2 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.