Quasi-One-Dimensional Spin Transport in Altermagnetic Z3 Nodal Net Metals

被引：1
作者：
He, Tingli [1 ,2 ]
Li, Lei [1 ,2 ]
Cui, Chaoxi [2 ]
Zhang, Run-Wu [2 ]
Yu, Zhi-Ming [2 ]
Liu, Guodong [1 ]
Zhang, Xiaoming [1 ]
机构：
[1] Hebei Univ Technol, Sch Mat Sci & Engn, State Key Lab Reliabil & Intelligence Elect Equipm, Tianjin 300401, Peoples R China
[2] Beijing Inst Technol, Sch Phys, Key Lab Adv Optoelect Quantum Architecture & Measu, Beijing Key Lab Nanophoton & Ultrafine Optoelect S, Beijing 100081, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2024年 / 133卷 / 14期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
TOTAL-ENERGY CALCULATIONS; WANNIER90; STABILITY; POINTS; TOOL;
D O I：
10.1103/PhysRevLett.133.146602
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In three dimensions, quasi-one-dimensional (Q1D) transport has traditionally been associated with systems featuring a Q1D chain structure. Here, based on first-principle calculations, we go beyond this understanding to show that the Q1D transport can also be realized in certain three-dimensional (3D) altermagnetic (AM) metals with a topological nodal net in momentum space but lacking Q1D chain structure in real space, including the existing compounds beta-Fe-2(PO4)O, Co-2(PO4)O, and LiTi2O4. These materials exhibit an AM ground state and feature an ideal crossed Z(3) Weyl nodal line in each spin channel around Fermi level, formed by three straight and flat nodal lines traversing the entire Brillouin zone. These nodal lines eventually lead to an AM Z(3) nodal net. Surprisingly, the electronic conductivity sigma(xx) in these topological nodal net metals is dozens of times larger than sigma(yy) and sigma(zz) in the up-spin channel, while sigma(yy) dominates transport in the down-spin channel. This suggests a distinctive Q1D transport signature in each spin channel, and the principal moving directions for the two spin channels are orthogonal, resulting in Q1D direction-dependent spin transport. This novel phenomenon cannot be found in both conventional 3D bulk materials and Q1D chain materials. In particular, the Q1D spin transport gradually disappears as the Fermi energy moves away from the nodal net, further confirming its topological origin. Our Letter not only enhances the comprehension of topological physics in altermagnets but also opens a new direction for the exploration of topological spintronics.
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页数：8
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