Orbital design of Berry curvature: pinch points and giant dipoles induced by crystal fields

Abstract

The Berry curvature (BC) - a quantity encoding the geometric properties of the electronic wavefunctions in a solid - is at the heart of different Hall-like transport phenomena, including the anomalous Hall and the non-linear Hall and Nernst effects. In non-magnetic quantum materials with acentric crystalline arrangements, local concentrations of BC are generally linked to single-particle wavefunctions that are a quantum superposition of electron and hole excitations. BC-mediated effects are consequently observed in two-dimensional systems with pairs of massive Dirac cones and three-dimensional bulk crystals with quartets of Weyl cones. Here, we demonstrate that in materials equipped with orbital degrees of freedom local BC concentrations can arise even in the complete absence of hole excitations. In these solids, the crystals fields appearing in very low-symmetric structures trigger BCs characterized by hot-spots and singular pinch points. These characteristics naturally yield giant BC dipoles and large non-linear transport responses in time-reversal symmetric conditions.

arXiv comment11 pages, 4 figure and supplemental material (6 pages, figures)

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• Chiral terahertz lasing with Berry curvature dipoles
• High orbital-moment Cooper pairs by crystalline symmetry breaking
• 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
• Sign competing sources of Berry curvature and anomalous Hall conductance humps in topological ferromagnets
• Orbital splitter effect and spatial resolution of current-induced orbital accumulation
• Gapless Topological Peierls-like instabilities in more than one dimension
• Hallmarks of spin textures for high-harmonic generation in two-dimensional materials
• Particle-hole spectral asymmetry at the edge of multiorbital noncentrosymmetric superconductors