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BaDElPh Highlights

Rashba coupling amplification by a staggered crystal field

We have investigated the giant Rashba-Dresselhaus spin-splitting of the electronic band structure of the centrosymmetric bulk BaNiS2 crystal by means of angle-resolved photoemission spectroscopy (ARPES) supported by ab initio calculations. The system is composed by light elements so the spin-orbit coupling could not account for the measured remarkable band splitting of ΔE ≈ 150 meV. This  is  explained  by a  huge staggered crystal field of 1.4 V/Å, produced by a gliding plane symmetry, that breaks inversion symmetry at the Ni site. This  unexpected  result  in  the  absence  of  heavy elements demonstrates an effective mechanism of Rashba coupling

amplification that may foster spin-orbit band engineering.

Retrieve article
Rashba coupling amplification by a staggered crystal field
D. Santos-Cottin,  M. Casula, G. Lantz, Y. Klein, L. Petaccia, P. Le Fèvre, F. Bertran, E. Papalazarou, M. Marsi, A. Gauzzi,
Nat. Commun. 7, 11258 (2016).
doi: 10.1038/ncomms11258

This paper was selected as an Elettra Top Story.

Ultima modifica il Domenica, 31 Gennaio 2021 15:32