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, P. D. C. King, J. Sánchez-Barriga, and F. Baumberger
Phys. Rev. B 93, 245143 – Published 22 June 2016

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.

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  • Received 19 February 2016
  • Revised 25 May 2016

DOI:https://doi.org/10.1103/PhysRevB.93.245143

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. McKeown Walker1,*, S. Riccò1, F. Y. Bruno1, A. de la Torre1, A. Tamai1, E. Golias2, A. Varykhalov2, D. Marchenko2, M. Hoesch3, M. S. Bahramy4,5, P. D. C. King6, J. Sánchez-Barriga2, and F. Baumberger1,7

  • 1Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
  • 2Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
  • 3Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
  • 4Quantum-Phase Electronics Center, Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
  • 5RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
  • 6SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, Fife KY16 9SS, United Kingdom
  • 7Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

  • *siobhan.mckeown@unige.ch

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Vol. 93, Iss. 24 — 15 June 2016

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