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Absence of giant spin splitting in the two-dimensional electron liquid at the surface of SrTiO 3 (001)

DOI: 10.1103/PhysRevB.93.245143 DOI Help

Authors: Siobhan Mckeown Walker (University of Geneva) , S. Riccò (University of Geneva) , F. Bruno (University of Geneva) , Alberto De La Torre (University of Geneva) , Anna Tamai (University of Geneva) , E. Golias (Helmholtz-Zentrum Berlin f ̈ ur Materialien und Energie) , A. Varykhalov (Helmholtz-Zentrum Berlin f ̈ ur Materialien und Energie) , D. Marchenko (Helmholtz-Zentrum Berlin f ̈ ur Materialien und Energie) , Moritz Hoesch (Diamond Light Source) , M. S. Bahramy (The University of Tokyo, University of St Andrews) , Philip King (University of St Andrews) , J. Sánchez-barriga (University of Geneva) , Felix Baumberger (Swiss Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 93 , PAGES 245143

State: Published (Approved)
Published: June 2016
Diamond Proposal Number(s): 11741

Abstract: We reinvestigate the putative giant spin splitting at the surface of SrTiO3 reported by Santander–Syro et al. [Nat. Mater. 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.

Subject Areas: Physics


Instruments: I05-ARPES

Other Facilities: Bessy II, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany