Optical gyrotropy in quadrupolar Kondo systems

Abstract

Recent experiments point to a variety of intermetallic systems which exhibit exotic quadrupolar orders driven by the Kondo coupling between conduction electrons and localized quadrupolar degrees of freedom. Using a Luttinger k.p Hamiltonian for the conduction electrons, we study the impact of such quadrupolar order on their energies and wave functions. We discover that such quadrupolar orders can induce a nontrivial Berry curvature for the conduction electron bands, leading to a nonvanishing optical gyrotropic effect. We estimate the magnitude of the gyrotropic response in a candidate quadrupolar material, PrPb3, and discuss the resulting Faraday rotation in thin films.

4+ pages, 2 figures

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Cited by in corpus (6)

• Topological spin crystals by itinerant frustration
• Unveiling Hidden Orders: Magnetostriction as a Probe of Multipolar-Ordered States
• Landau theory of multipolar orders in Pr(TM)${}_2$X${}_{20}$ Kondo materials
• Two-stage multipolar ordering in Pr(TM)${}_2$Al${}_{20}$ Kondo materials
• Thermal and field-induced transitions in ferroquadrupolar Kondo systems
• Field-tunable quadruple-$Q$ states driven by momentum-space frustration