مقاله انتقال اسپین شبه یک بعدی در فلزات شبکه گرهی ضد فرومغناطیسی Z3

چکیده

In three dimensions, the quasi-one-dimensional (Q1D) transport is commonly thought to only appear in the systems with Q1D chain structure. Here, based on first-principle calculations, we go beyond the common belief to show that the Q1D transport can also be realized in many 3D antiferromagnetic (AFM) metals with topological node structure but without Q1D chain structure, including the existing compounds \b{eta}-Fe2(PO4)O and Co2(PO4)O, and LiTi2O4. All these materials have an AFM ground state and exhibit an ideal crossed Z3 Weyl nodal line in each spin channel, formed by three straight and flat nodal lines traversing the whole Brillouin zone. These nodal lines eventually lead to an AFM Z3 nodal net. Surprisingly, we find that the longitudinal conductivity σxx in these topological nodal net metals is dozens of times larger than σyy and σzz in the up-spin channel, while σyy dominates the transport in the down-spin channel. This means that each spin channel has a Q1D transport signature, and the principal moving direction for the two spin channels is orthogonal, leading to Q1D direction-dependent spin transport. This novel phenomenon can not be found in both conventional 3D bulk materials and Q1D chain materials, and may solely be induced by the Z3 nodal net, as it gradually disappears when the Fermi level moves away from the nodal net. Our work not only enhances the comprehension of topological physics in antiferromagnets, but also opens a new direction for the exploration of topological spintronics.

چکیده به فارسی (ترجمه ماشینی)