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, F. Baumberger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

109 Citations (Scopus)
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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.

Original languageEnglish
Article number3414
Number of pages7
JournalNature Communications
Volume5
DOIs
Publication statusPublished - 27 Feb 2014

Keywords

  • LAALO3/SRTIO3 Interface
  • Oxide interfaces
  • Superconductivity
  • Superlattices
  • Insulator
  • Surface
  • State

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