A Striped Electron Fluid on (111) KTaO${}_3$

Abstract

A recent study has revealed that the low carrier density electron gas (2DEG) induced at the interface of EuO and (111) KTaO${}_3$ exhibits a broken symmetry phase with a strong in-plane anisotropy of the resistivity. We present a minimal tight binding model of this (111) 2DEG, including the large spin-orbit coupling from the Ta ions, which reveals a hexagonal Fermi surface with a highly enhanced 2$k_F$ electronic susceptibility. We argue that repulsive electronic interactions, together with a ferromagnetic EuO substrate, favor a magnetic stripe instability leading to a partially gapped Fermi surface. Such a stripe state, or its vestigial nematicity, could explain the observed transport anisotropy. We propose a $k\cdot p$ theory for the low energy $j=3/2$ states, which captures the key results from our tight-binding study, and further reveals the intertwined dipolar and octupolar modulations underlying this magnetic stripe order. We conclude by speculating on the relation of this stripe order to the superconductivity seen in this material.

References in corpus (26)

• High-temperature superconductivity in iron-based materials
• Superconductivity in Cu_xTiSe_2
• Electronic liquid crystal state in the high-temperature superconductor YBCO(6.45)
• Interface engineering of quantum Hall effects in digital transition metal oxide heterostructures
• Electrical Resistivity Anisotropy from Self-Organized One-Dimensionality in High-Temperature Superconductors
• The Physics of Pair Density Waves
• Spin-Rotation Symmetry Breaking in the Superconducting State of CuxBi2Se3
• Thermodynamic evidence for nematic superconductivity in Cu${}_x$Bi${}_2$Se${}_3$
• Exotic phases induced by strong spin-orbit coupling in ordered double perovskites
• Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO${}_3$
• Intertwined vestigial order in quantum materials: nematicity and beyond
• Theory of t2g electron-gas Rashba interactions
• Parity-breaking phases of spin-orbit-coupled metals with gyrotropic, ferroelectric and multipolar orders
• Modeling the Fermi arc in underdoped cuprates
• A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd${}_2$Re${}_2$O${}_7$
• Observation of Dirac-like energy band and ring-torus Fermi surface associated with the nodal line in topological insulator CaAgAs
• Pairing states of spin-3/2 fermions: Symmetry-enforced topological gap functions
• Electric Toroidal Quadrupoles in Spin-Orbit Coupled Metal Cd${}_2$Re${}_2$O${}_7$
• Vestigial nematic order and superconductivity in the doped topological insulator Cu${}_x$Bi${}_2$Se${}_3$
• Octupolar order in d-orbital Mott insulators
• Band Structure and Spin-Orbital Texture of the (111)-KTaO3 Two-Dimensional Electron Gas
• Vestigial nematicity from spin and/or charge order in the cuprates
• Multipolar magnetism in d-orbital systems: Crystal field levels, octupolar order, and orbital loop currents
• The nature of the tensor order in Cd2Re2O7
• Symmetry of the charge density wave in cuprates
• Magnetic and nematic orders of the 2DEG at oxide (111) surfaces and interfaces

Cited by in corpus (9)

• Tunable superconductivity at the oxide-insulator/KTaO${}_3$ interface and its origin
• Spontaneous rotational symmetry breaking in KTaO${}_3$ heterointerface superconductors
• Enhanced Critical Field of Superconductivity at an Oxide Interface
• Nematic order driven by superconducting correlations
• Violation of Pauli Limit at KTaO3(110) Interfaces
• Orbital selective order and ${\mathbb{Z}}_3$ Potts nematicity from a non-Fermi liquid
• Superconductivity from the Slater mode: Application to KTaO3 heterostructures
• Percolative Pathway to Stripe Order in KTaO3-Based Superconductivity
• Beyond spin-1/2: Multipolar spin-orbit coupling in noncentrosymmetric crystals with time-reversal symmetry