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The interplay between chirality and topology nurtures many exotic electronicproperties. For instance, topological chiral semimetals display multifoldchiral fermions that manifest nontrivial topological charge and spin texture.They are an ideal playground for exploring chirality-driven exotic physicalphenomena. In this work, we reveal a monopole-like orbital-momentum lockingtexture on the three-dimensional Fermi surfaces of topological chiralsemimetals with B20 structures (e.g., RhSi and PdGa). This orbital textureenables a large orbital Hall effect (OHE) and a giant orbital magnetoelectric(OME) effect in the presence of current flow. Different enantiomers exhibit thesame OHE which can be converted to the spin Hall effect by spin-orbit couplingin materials. In contrast, the OME effect is chirality-dependent and muchlarger than its spin counterpart. Our work reveals the crucial role of orbitaltexture for understanding OHE and OME effects in topological chiral semimetalsand paves the path for applications in orbitronics, spintronics, and enantiomerrecognition.

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