Multipolar orders in d-orbital systems

Traditionally, magnetism in solids deals with ordering patterns of the electron magnetic dipole moment, as probed, for instance, via neutron diffraction. However, in quantum materials can also exhibit more complex forms of symmetry breaking, involving higher-order magnetic or electric multipoles. In this talk, I will discuss our recent theoretical proposal for Ising octupolar order in d-orbital systems, which explains a wide range of experiments in certain 5d transition metal oxides with spin-orbit coupling.  Such multipolar symmetry broken states might serve as potential platforms for information storage. I will also highlight new experiments on realizing 2DEGs with j=3/2 fermions, which our theory suggests as candidates for multipolar stripe ordering.

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