Quasiparticle dynamics and spin–orbital texture of the SrTiO3 two-dimensional electron gas

P. D. C. King (), S. McKeown Walker, A. Tamai, A. de la Torre, T. Eknapakul, P. Buaphet, S.-K. Mo, W. Meevasana, M. S. Bahramy and F. Baumberger ()
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P. D. C. King: Kavli Institute at Cornell for Nanoscale Science
S. McKeown Walker: Université de Genève
A. Tamai: Université de Genève
A. de la Torre: Université de Genève
T. Eknapakul: School of Physics and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology
P. Buaphet: School of Physics and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology
S.-K. Mo: Advanced Light Source, Lawrence Berkeley National Lab
W. Meevasana: School of Physics and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology
M. S. Bahramy: Quantum-Phase Electronics Center, The University of Tokyo
F. Baumberger: SUPA, School of Physics and Astronomy, University of St Andrews

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Two-dimensional electron gases (2DEGs) in SrTiO3 have become model systems for engineering emergent behaviour in complex transition metal oxides. Understanding the collective interactions that enable this, however, has thus far proved elusive. Here we demonstrate that angle-resolved photoemission can directly image the quasiparticle dynamics of the d-electron subband ladder of this complex-oxide 2DEG. Combined with realistic tight-binding supercell calculations, we uncover how quantum confinement and inversion symmetry breaking collectively tune the delicate interplay of charge, spin, orbital and lattice degrees of freedom in this system. We reveal how they lead to pronounced orbital ordering, mediate an orbitally enhanced Rashba splitting with complex subband-dependent spin–orbital textures and markedly change the character of electron–phonon coupling, co-operatively shaping the low-energy electronic structure of the 2DEG. Our results allow for a unified understanding of spectroscopic and transport measurements across different classes of SrTiO3-based 2DEGs, and yield new microscopic insights on their functional properties.

Date: 2014
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DOI: 10.1038/ncomms4414

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