Absence of giant spin splitting in the two-dimensional electron liquid at the surface of SrTiO3 (001)
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We reinvestigate the putative giant spin splitting at the surface of SrTiO3 reported by Santander-Syro et al. [Nature Mat. 13, 1085 (2014)]. Our spin- and angle-resolved photoemission experiments on fractured (001) oriented surfaces supporting a two-dimensional electron liquid with high carrier density show no detectable spin polarization in the photocurrent. We demonstrate that this result excludes a giant spin splitting while it is consistent with the unconventional Rashba-like splitting seen in band structure calculations that reproduce the experimentally observed ladder of quantum confined subbands.
McKeown Walker , S , Riccò , S , Bruno , F Y , de la Torre , A , Tamai , A , Golias , E , Varykhalov , A , Marchenko , D , Hoesch , M , Bahramy , M S , King , P D , Sánchez-Barriga , J & Baumberger , F 2016 , ' Absence of giant spin splitting in the two-dimensional electron liquid at the surface of SrTiO 3 (001) ' Physical Review. B, Condensed matter and materials physics , vol. 93 , no. 24 , 245143 . DOI: 10.1103/PhysRevB.93.245143
Physical Review. B, Condensed matter and materials physics
© 2016, American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at journals.aps.org / https://dx.doi.org/10.1103/PhysRevB.93.245143
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