顺磁性Co$_{1/3}$NbS$_2$中的磁手性隧穿
Magnetochiral Tunneling in Paramagnetic Co$_{1/3}$NbS$_2$
AI总结：
本文在顺磁性手性金属Co$_{1/3}$NbS$_2$中演示了隧穿电流诱导磁化与探针磁化耦合产生的磁手性隧穿效应，实现原子级手性畴成像，并用第一性原理计算支持该机制。
摘要：
电流具有一种引人入胜的能力，即在晶体对称性足够低的非磁性晶体中诱导磁化。相关现象包括极性晶体中的非线性反常霍尔效应，以及在施加磁场时手性晶体中的非互易定向二色性。在本工作中，我们证明相同的底层物理也体现在非磁性手性材料表面与磁化扫描探针之间的电子隧穿过程中。在顺磁性但手性的金属化合物Co$_{1/3}$NbS$_2$中，隧穿电流诱导的磁化被证明可通过其与探针尖端自身磁化的耦合而被检测到。这导致不同手性畴之间产生对比，实现了结构手性的原子级空间分辨率。为支持所提出的机制，我们使用第一性原理理论计算了材料体相中依赖于手性的电流诱导磁化和贝里曲率。我们对这种磁手性隧穿效应的演示，为研究低对称性非磁性晶体结构畴边界处局部晶体对称性和电子结构的原子级变化开辟了新途径。
英文摘要：
Electric currents have the intriguing ability to induce magnetization in nonmagnetic crystals with sufficiently low crystallographic symmetry. Some associated phenomena include the non-linear anomalous Hall effect in polar crystals and the nonreciprocal directional dichroism in chiral crystals when magnetic fields are applied. In this work, we demonstrate that the same underlying physics is also manifested in the electronic tunneling process between the surface of a nonmagnetic chiral material and a magnetized scanning probe. In the paramagnetic but chiral metallic compound Co$_{1/3}$NbS$_2$, the magnetization induced by the tunneling current is shown to become detectable by its coupling to the magnetization of the tip itself. This results in a contrast across different chiral domains, achieving atomic-scale spatial resolution of structural chirality. To support the proposed mechanism, we used first-principles theory to compute the chirality-dependent current-induced magnetization and Berry curvature in the bulk of the material. Our demonstration of this magnetochiral tunneling effect opens up a new avenue for investigating atomic-scale variations in the local crystallographic symmetry and electronic structure across the structural domain boundaries of low-symmetry nonmagnetic crystals.
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