在手性二硅化物NbSi $_2$和TaSi $_2$的多晶体样品中检测手性诱导的毫米级自旋极化
Detection of chirality-induced spin polarization over millimeters in polycrystalline bulk samples of chiral disilicides NbSi$_2$ and TaSi$_2$
摘要：
我们报告说，自旋极化发生在毫米以上的手性二硅化物NbSi $_2$和TaSi $_2$的多晶体样品。如先前在使用NbSi $_2$和TaSi $_2$的单晶的实验中所证明的，电输运测量允许甚至在手性多晶中检测与手性诱导的自旋极化相关联的正信号和逆信号。自旋极化信号也出现在非局部测量中，其中电荷电流仅在距离检测电极几毫米的区域中流动。这些数据意味着自旋极化现象的发生，而不管在多晶体中的晶粒的存在，表明手性诱导的自旋极化的鲁棒性和弹性。根据实验数据，我们发现自旋输运信号符合求和规则。在多晶体中平均确定样品上的旋向性分布。虽然保持毫米以上的自旋极化的机制仍有待澄清，本研究可能会开辟前景的自旋控制和操纵宏观长度尺度上使用手性材料。
英文摘要：
We report that spin polarization occurs over millimeters in polycrystalline bulk samples of chiral disilicide NbSi$_2$ and TaSi$_2$. As previously demonstrated in the experiments using single crystals of NbSi$_2$ and TaSi$_2$, electrical transport measurements allow detection of direct and inverse signals associated with the chirality-induced spin polarization even in the chiral polycrystals. The spin polarization signals also appear in nonlocal measurements, in which charge current flows only in the area millimeters away from the detection electrode. These data mean that the spin polarization phenomena occur regardless of the presence of crystalline grains in the polycrystals, indicating a robustness and resilience of the chirality-induced spin polarization. On the basis of the experimental data, we found that the sum rule holds for the spin transport signals. A distribution of handedness over the samples was determined on average in the polycrystals. While the mechanism of preserving the spin polarization over millimeters remains to be clarified, the present study may open up prospects of spin control and manipulation over macroscopic length scales using chiral materials.
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