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Nuclear spin polarization induced by hyperfine interaction and the Edelsteineffect due to strong spin-orbit interaction is investigated by quantumtransport in Bi(111) thin film samples. The Bi(111) films are deposited on micaby van der Waals epitaxial growth. The Bi(111) films show micrometer-sizedtriangular islands with 0.39 nm step height, corresponding to the Bi(111)bilayer height. At low temperatures a high current density is applied togenerate a non-equilibrium carrier spin polarization by the Edelstein effect atthe Bi(111) surface, which then induces dynamic nuclear polarization byhyperfine interaction. Comparative quantum magnetotransport antilocalizationmeasurements indicate a suppression of antilocalization by the in-planeOverhauser field from the nuclear polarization and allow a quantification ofthe Overhauser field. Hence nuclear polarization was both achieved andquantified by a purely electronic transport-based approach.

Dynamic nuclear spin polarization induced by Edelstein effect at Bi(111) surfaces