Absence of giant spin splitting in the two-dimensional electron liquid at the surface of SrTiO3 (001)

S McKeown Walker, S Riccò, F Y Bruno, A de la Torre, A Tamai, E Golias, A Varykhalov, D Marchenko, M Hoesch, M S Bahramy, Philip David King, J Sánchez-Barriga, F Baumberger

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20 Citations (Scopus)

Abstract

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.
Original languageEnglish
Article number245143
Number of pages5
JournalPhysical Review. B, Condensed matter and materials physics
Volume93
Issue number24
DOIs
Publication statusPublished - 22 Jun 2016

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