Quasi-one-dimensional spin transport in altermagnetic Z^3 nodal net metals
arxiv(2024)
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 the common belief to show that the
Q1D transport can also be realized in many 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
β-Fe_2(PO_4)O, Co_2(PO_4)O, and LiTi_2O_4. These materials
exhibit an AM ground state and feature an ideal crossed Z^3 Weyl nodal line
in each spin channel, 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, longitudinal conductivity σ_xx in these
topological nodal net metals is dozens of times larger than σ_yy and
σ_zz in the up-spin channel, while σ_yy dominates transport
in the down-spin channel. This suggests a distinctive Q1D transport signature
in each spin channel, with orthogonal principal moving directions for the two
spin channels, 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, it gradually disappears as the Fermi level moves away
from the nodal net, further confirming its topological origin. Our work 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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