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

Published innpj quantum materials, vol. 8, no. 12
Publication date2023-02-28
First online date2023-02-28
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.

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Citation (ISO format)
MERCALDO, Maria Teresa et al. Orbital design of Berry curvature: pinch points and giant dipoles induced by crystal fields. In: npj quantum materials, 2023, vol. 8, n° 12. doi: 10.1038/s41535-023-00545-y
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Additional URL for this publicationhttps://www.nature.com/articles/s41535-023-00545-y
Journal ISSN2397-4648
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Creation06/03/2023 09:53:00
First validation06/03/2023 09:53:00
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