2014/02/27 by P. D. C. King, S. McKeown Walker, A. Tamai +9 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Condensed matter physics #Electron #Electronic and Structural Properties of Oxides #Electronic structure #Fermi gas #Magnetic and transport properties of perovskites and related materials #Physics #Point reflection #Quantum mechanics #Quasiparticle #Semiconductor materials and devices #Supercell #Superconductivity #cond-mat.mes-hall #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1038/ncomms4414
published as Nature Communications 5, 3414 (2014) · 10 pages including supplementary information, 4+4 figures
openalex publication_date 2014/02/27 · arxiv created 2014/09/07 · arxiv updated 2014/09/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.