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We report that spin polarization occurs over millimeters in polycrystallinebulk samples of chiral disilicide NbSi$_2$ and TaSi$_2$. As previouslydemonstrated in the experiments using single crystals of NbSi$_2$ and TaSi$_2$,electrical transport measurements allow detection of direct and inverse signalsassociated with the chirality-induced spin polarization even in the chiralpolycrystals. The spin polarization signals also appear in nonlocalmeasurements, in which charge current flows only in the area millimeters awayfrom the detection electrode. These data mean that the spin polarizationphenomena occur regardless of the presence of crystalline grains in thepolycrystals, indicating a robustness and resilience of the chirality-inducedspin polarization. On the basis of the experimental data, we found that the sumrule holds for the spin transport signals. A distribution of handedness overthe samples was determined on average in the polycrystals. While the mechanismof preserving the spin polarization over millimeters remains to be clarified,the present study may open up prospects of spin control and manipulation overmacroscopic length scales using chiral materials.

Detection of chirality-induced spin polarization over millimeters in polycrystalline bulk samples of chiral disilicides NbSi$_2$ and TaSi$_2$