Designing spin and orbital sources of Berry curvature at oxide interfaces

Abstract

Quantum materials can display physical phenomena rooted in the geometry of electronic wavefunctions. The corresponding geometric tensor is characterized by an emergent field known as Berry curvature (BC). Large BCs typically arise when electronic states with different spin, orbital or sublattice quantum numbers hybridize at finite crystal momentum. In all materials known to date, the BC is triggered by the hybridization of a single type of quantum number. Here, we report the discovery of the first material system having both spin and orbital-sourced BC: LaAlO${}_3$/SrTiO${}_3$ interfaces grown along the [111] direction. We detect independently these two sources and directly probe the BC associated to the spin quantum number through measurements of an anomalous planar Hall effect. The observation of a nonlinear Hall effect with time-reversal symmetry signals large orbital-mediated BC dipoles. The coexistence of different forms of BC enables the combination of spintronic and optoelectronic functionalities in a single material.

arXiv comment32 pages, 25 figures, accepted in Nature Materials

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• The quantum metric of electrons with spin-momentum locking
• Orbitronics in Two-dimensional Materials
• Orbital design of Berry curvature: pinch points and giant dipoles induced by crystal fields
• Observation of in-plane anomalous Hall effect associated with orbital magnetization
• Berry Curvature Signatures in Chiroptical Excitonic Transitions
• Large nonlinear Hall effect and Berry curvature in KTaO3 based two-dimensional electron gas
• Giant Third-Order Nonlinearity Induced by the Quantum Metric Quadrupole in Few-Layer WTe2
• Observation of the anomalous Hall effect in a layered polar semiconductor
• Berry Curvature Dipole and its Strain Engineering in Layered Phosphorene
• Chiral terahertz lasing with Berry curvature dipoles
• High orbital-moment Cooper pairs by crystalline symmetry breaking
• Spontaneous in-plane anomalous Hall response observed in a ferromagnetic oxide
• Anomalous Hall effect in Dirac semimetal probed by in-plane magnetic field
• Enhanced Non-linear Response by Manipulating the Dirac Point in the (111) LaTiO${}_3$/SrTiO${}_3$ Interface
• Layer Coherence Origin of Planar Hall Effect: from Charge to Multipole and Valley
• Dissipationless transport signature of topological nodal lines
• Moiré amplification of highly tunable shift current response in twisted trilayer graphene
• Interplay between inversion and translation symmetries in trigonal PtBi${}_2$
• Nonlinear planar magnetotransport as a probe of the topology of surface states
• Filtering Spin and Orbital Moment in Centrosymmetric Systems
• Role of Disorder in Third-order Anomalous Hall Effect in Time-reversal Symmetric Systems
• Dirac-like fermions anomalous magneto-transport in a spin-polarized oxide two-dimensional electron system
• Gapless Topological Peierls-like instabilities in more than one dimension
• Sign competing sources of Berry curvature and anomalous Hall conductance humps in topological ferromagnets
• Hallmarks of spin textures for high-harmonic generation in two-dimensional materials
• Particle-hole spectral asymmetry at the edge of multiorbital noncentrosymmetric superconductors
• Spontaneous Symmetry Breaking of Cavity Vacuum and Emergent Gyrotropic Effects in Embedded moiré Superlattices
• Magneto-cubic and magneto-linear dependence observed in an in-plane anomalous Hall magnet