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oai:figshare.com:article/34022520 2026-09-29T10:03:32Z category_1 category_915 category_7 category_8 category_12 category_13 category_14 category_16 category_873 category_734 category_61 category_62 portal_63 item_type_6 month_year_09_2026

Weyl-Transition-Driven Giant Reversible Orbital Hall Conductivity Bo Zhao (13553) Hao Wang (39217) Wei Ren (267391) Hongbin Zhang (258308) Biophysics Physical Sciences not elsewhere classified Medicine Microbiology Cell Biology Genetics Molecular Biology Physiology Chemical Sciences not elsewhere classified Biological Sciences not elsewhere classified Developmental Biology Marine Biology orbital quantum geometry orbital hall conductivity chiral orbital texture sizable ohc already giant ohc dominated cone tilting transition 2 </ sub reversibly controlling ohc ii weyl point ii → type orbital materials ii weyl reversibly switching → type zone integration zeroth order using first principles calculations polar multi monolayer ptbi crossing bands The orbital Hall conductivity (OHC) is central to orbitronics, yet its microscopic control remains largely unexplored. Here we identify a general mechanism in which tilted Weyl crossings formed by orbitally distinct bands generate a strongly asymmetric orbital Berry curvature (OBC) distribution, whose imbalance survives Brillouin-zone integration and yields a sizable OHC already at zeroth order. Using first-principles calculations, we show that monolayer PtBi₂ realizes this mechanism and hosts a giant OHC dominated by a type-II Weyl point. A small biaxial tensile strain drives a type-II → type-I → type-II Weyl-cone tilting transition, reversibly switching the sign of the OHC through the chiral orbital texture of the crossing bands, assisted by a strain-induced structural phase transition. Our results establish Weyl engineering of orbital quantum geometry as a route to generating and reversibly controlling OHC in polar multi-orbital materials. 2026-09-29T00:00:00Z Text Journal contribution 10.1021/acs.nanolett.6c04069.s001 https://figshare.com/articles/journal_contribution/Weyl-Transition-Driven_Giant_Reversible_Orbital_Hall_Conductivity/34022520 CC BY-NC 4.0