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arXiv · 2608.19648

Giant orbital Hall effect from cubic Dresselhaus orbital coupling

Gwen Sevilen·Kyoung-Min Kim
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Abstract

The orbital Berry curvature (OBC) governs the intrinsic orbital Hall conductivity (OHC), a central quantity in orbitronics. Previous approaches for enhancing the OHC have primarily relied on a linearin-momentum, Rashba-type orbital coupling. Here, we show that cubic Dresselhaus orbital coupling offers a new route to enhancing the OHC. Using an effective two-orbital band model, we show that the cubic coupling generates momentum-space hot spots, absent in the purely linear case, at which the OBC is strongly enhanced. This local enhancement, together with the multiplicity of the hot spots, boosts the OHC by more than an order of magnitude relative to the linear-coupling value. We further find that the OHC diverges inversely with the level splitting in the small-splitting limit, with a divergence coefficient universally seventeen times larger than that of the linear case. These results establish cubic Dresselhaus coupling as a route to giant orbital Hall responses, opening new avenues for orbitronic device applications.

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Gwen Sevilen, Kyoung-Min Kim. 2026-08-20. Giant orbital Hall effect from cubic Dresselhaus orbital coupling. https://arxiv.org/abs/2608.19648

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