Switchable chiral transport in charge-ordered kagome metal CsV(3)Sb(5).
Switchable chiral transport in charge-ordered kagome metal CsV(3)Sb(5).
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DOI：
10.1038/s41586-022-05127-9
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发表时间：
2022-11
期刊：
影响因子：
64.8
通讯作者：
Moll, Philip J. W.
中科院分区：
文献类型：
--
作者：
Guo, Chunyu;Putzke, Carsten;Konyzheva, Sofia;Huang, Xiangwei;Gutierrez-Amigo, Martin;Errea, Ion;Chen, Dong;Vergniory, Maia G.;Felser, Claudia;Fischer, Mark H.;Neupert, Titus;Moll, Philip J. W.
当电导体与其镜像不同时，出现了在非手性金属中被禁止的不寻常的手性输运系数，例如被称为电子磁手性各向异性(EMChA)的非线性电响应。虽然手性输运信号在许多导体中是对称的，没有反转中心，但它们只有在极少数情况下才能达到可察觉的水平，在这种情况下，存在与巡回电子的极强手性耦合。到目前为止，对手性输运的观察仅限于原子位置强烈破坏镜面对称性的材料。在这里，我们报道了中心对称的层状Kagome金属CsV3Sb5在面内磁场下通过二次谐波产生的手性输运。只有当温度低于35 K时，eMChA信号才变得有效，该温度位于CsV3Sb5(TCDW ≈ 94 K)的电荷有序状态的深处。这种温度依赖关系揭示了电子手性、单向电荷有序和假定的轨道环流引起的自发时反对称破缺之间的直接对应关系。我们证明了手性是由离面场分量设置的，并且通过改变场符号可以引起从左手输运到右手输运的转变。CsV3Sb5是第一个可以通过微小的磁场变化控制和切换强手性输运的材料，这与结构上的手性材料形成了鲜明的对比，这是在手性电子学中应用的先决条件。在层状Kagome金属CsV3Sb5中，手性从左手到右手输运的变化可以通过微小的磁场变化来控制，这是手性电子应用所必需的特征。
When electric conductors differ from their mirror image, unusual chiral transport coefficients appear that are forbidden in achiral metals, such as a non-linear electric response known as electronic magnetochiral anisotropy (eMChA). Although chiral transport signatures are allowed by symmetry in many conductors without a centre of inversion, they reach appreciable levels only in rare cases in which an exceptionally strong chiral coupling to the itinerant electrons is present. So far, observations of chiral transport have been limited to materials in which the atomic positions strongly break mirror symmetries. Here, we report chiral transport in the centrosymmetric layered kagome metal CsV3Sb5 observed via second-harmonic generation under an in-plane magnetic field. The eMChA signal becomes significant only at temperatures below 35 K, deep within the charge-ordered state of CsV3Sb5 (TCDW ≈ 94 K). This temperature dependence reveals a direct correspondence between electronic chirality, unidirectional charge order and spontaneous time-reversal symmetry breaking due to putative orbital loop currents. We show that the chirality is set by the out-of-plane field component and that a transition from left- to right-handed transport can be induced by changing the field sign. CsV3Sb5 is the first material in which strong chiral transport can be controlled and switched by small magnetic field changes, in stark contrast to structurally chiral materials, which is a prerequisite for applications in chiral electronics. Change of chirality from left- to right-handed transport in the layered kagome metal CsV3Sb5 can be controlled by small magnetic field changes, a required feature for chiral electronic applications.
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