Anomalous orbital structure in a spinel-perovskite interface $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$

Abstract

In all archetypical reported (001)-oriented perovskite heterostructures, it has been deduced that the preferential occupation of two-dimensional electron gases is in-plane $d_{\text{xy}}$ state. In sharp contrast to this, the investigated electronic structure of a spinel-perovskite heterostructure $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ by resonant soft X-ray linear dichroism, demonstrates that the preferential occupation is out-of-plane $d_{\text{xz}}$/$d_{\text{yz}}$ states for interfacial electrons. Moreover, the impact of strain further corroborates that this anomalous orbital structure can be linked to the altered crystal field at the interface and symmetry breaking of the interfacial structural units. Our findings provide another interesting route to engineer emergent quantum states with deterministic orbital symmetry.

arXiv comment4 figures

References in corpus (20)

• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
• Coexistence of superconductivity and ferromagnetism in two dimensions
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• A high-mobility two-dimensional electron gas at the heteroepitaxial spinel/perovskite complex oxide interface of γ-Al2O3/SrTiO3
• Orbital reconstruction and two-dimensional electron gas at the LaAlO3/SrTiO3 interface
• Emergent properties hidden in plane view: Strong electronic correlations at oxide interfaces
• Superconductivity and Ferromagnetism in Oxide Interface Structures: Possibility of Finite Momentum Pairing
• Origin of interface magnetism in BiMnO3/SrTiO3 and LaAlO3/SrTiO3 heterostructures
• One-sign order parameter in iron based superconductor
• Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygen
• Engineered Mott ground state in LaTiO${}_{3+\delta }$/LaNiO${}_3$ heterostructure
• Mixed Dimensionality of Confined Conducting Electrons in the Surface Region of SrTiO${}_3$
• Room temperature formation of high-mobility two-dimensional electron gases at crystalline complex oxide interfaces
• Localized vs. delocalized character of charge carriers in LaAlO3/ SrTiO3 superlattices
• Large modulation of the Shubnikov-de Haas oscillations by the Rashba interaction at the LaAlO${}_3$/SrTiO${}_3$ interface
• Magnetic interactions at the nanoscale in trilayer titanates LaTiO${}_3$/SrTiO${}_3$/YTiO${}_3$
• Microscopic understanding of the orbital splitting and its tuning at oxide interfaces

Cited by in corpus (18)

• Giant tunability of the two-dimensional electron gas at the interface of gamma-Al2O3/SrTiO3
• Strain engineering of epitaxial oxide heterostructures beyond substrate limitations
• Microscopic origin of the mobility enhancement at a spinel/perovskite oxide heterointerface revealed by photoemission spectroscopy
• Magnetic and electronic properties at the gamma-Al2O3/SrTiO3 interface
• Decoupling carrier concentration and electron-phonon coupling in oxide heterostructures observed with resonant inelastic x-ray scattering
• Band-Order Anomaly at the γ-Al2O3/SrTiO3 Interface Drives the Electron-Mobility Boost
• Suppressed carrier density for the patterned high mobility two-dimensional electron gas at gamma-Al2O3/SrTiO3 heterointerfaces
• Ferroelectric control of spin-polarized two-dimensional electron gas
• Electron trapping and detrapping in an oxide two-dimensional electron gas: The role of ferroelastic twin walls
• Unconventional crystal field splitting in non-centrosymmetric BaTiO${}_3$ thin films
• Engineered Kondo screening and nonzero Berry phase in SrTiO3/LaTiO3/SrTiO3 heterostructures
• Electronic properties of ultra-thin YCrO3 films
• High-mobility two-dimensional electron gas in $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ heterostructures
• Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO${}_3$-based interfaces
• Metallic interfaces in a CaTiO${}_3$/LaTiO${}_3$ heterostructure
• Beyond being free: glassy dynamics of SrTiO${}_3$-based two-dimensional electron gas
• Orthorhombic distortion drives orbital ordering in an antiferromagnetic 3$d^1$ Mott insulator
• Leveraging high fluence and low pressure for pulsed laser deposition of high-mobility $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ heterostructure growth