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Monopole-like orbital-momentum locking and the induced orbital transport in topological chiral semimetals

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Yang,  Qun
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Robredo,  Iñigo
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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G. Vergniory,  Maia
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Yang, Q., Xiao, J., Robredo, I., G. Vergniory, M., Yan, B., & Felser, C. (2023). Monopole-like orbital-momentum locking and the induced orbital transport in topological chiral semimetals. Proceedings of the National Academy of Sciences of the United States of America, 120(48): e2305541120, pp. 1-7. doi:10.1073/pnas.2305541120.


Cite as: https://hdl.handle.net/21.11116/0000-000E-02FC-4
Abstract
The interplay between chirality and topology nurtures many exotic electronic properties. For instance, topological chiral semimetals display multifold chiral fermions that manifest nontrivial topological charge and spin texture. They are an ideal playground for exploring chirality-driven exotic physical phenomena. In this work, we reveal a monopole-like orbital-momentum locking texture on the three-dimensional Fermi surfaces of topological chiral semimetals with B20 structures (e.g., RhSi and PdGa). This orbital texture enables a large orbital Hall effect (OHE) and a giant orbital magnetoelectric (OME) effect in the presence of current flow. Different enantiomers exhibit the same OHE which can be converted to the spin Hall effect by spin-orbit coupling in materials. In contrast, the OME effect is chirality-dependent and much larger than its spin counterpart. Our work reveals the crucial role of orbital texture for understanding OHE and OME effects in topological chiral semimetals and paves the path for applications in orbitronics, spintronics, and enantiomer recognition.