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MA: Fachverband Magnetismus

MA 47: Poster III

MA 47.8: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster D

Catalogue of C-paired spin-valley locking in antiferromagnetic system — •Mengli Hu¹, Xingkai Cheng², Zhenqiao Huang², and Junwei Liu² — ¹Institute for Theoretical Solid State Physics, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — ²Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China

We propose an algorithm to determine C-paired spin-valley locking (SVL) in any magnetic space group (MSG) based on the little co-group and coset representatives, which allows us to naturally classify C-paired SVL into collinear, coplanar, and spatial categories and identify four elementary types that compose all possible C-paired SVL in 1651 MSGs. By combining the proposed algorithm and high-throughput first-principles calculations, we identify 140 out of 1794 antiferromagnetic (AFM) materials from MAGNDATA that can realize C-paired SVL with experimentally verified magnetic structure. Besides identifying new material candidates, the classification can also reveal the underlying mechanism of responses of C-paired SVL to external fields. As an example of PbNiO₃, two qualitatively different types of piezomagnetism via occupation imbalance or spin tilting can be realized by breaking the little co-group or coset representatives, respectively. Moreover, our algorithm is also applicable to locking between valley/momentum and any kind of pseudo-vector degree of freedom, e.g. Berry curvature distribution, as demonstrated in the example of PbNiO₃.

Keywords: Spin-valley locking; Antiferromagnetic materials; Piezomagnetism; Spintronics