First-principles study of odd-parity responses driven by conventional antiferromagnetism
ORAL
Abstract
Altermagnets, defined as collinear antiferromagnets with broken time-reversal symmetry, exhibits large nonrelativistic spin splitting due to the broken time-reversal symmetry [1,2]. Altermagnets have attracted considerable attention in recent years because of its rich physical responses, including the anomalous Hall effect [3], spin current generation [4,5], and giant magnetoresistance [6]. In contrast, conventional antiferromagnets, which are characterized as collinear antiferromagnets without nonrelativistic spin splitting, has received far less attention.
In this work, we focus on conventional antiferromagnets that preserve time-reversal symmetry. We point out that such systems necessarily possess a finite Q vector, which leads to nontrivial symmetry breaking due to the incompatibility between Q vector and nonsymmorphic symmetry. Importantly, this nontrivial symmetry breaking gives rise to odd-parity responses originating from conventional antiferromagnetism [7]. Furthermore, we identify MnS₂ and YMn₂ as candidate materials for realizing such odd-parity responses in conventional antiferromagnets. In this study, we will discuss these findings based on a detailed theoretical framework employing spin space groups, as well as first-principles calculations that evaluate the Berry curvature dipole and shift current response in the candidate materials.
[1] L. Šmejkal, et al., PRX. 12, 040501 (2022).
[2] L. Šmejkal, et al., PRX. 12, 031042 (2022).
[3] L. Šmejkal, et al., Sci. Adv. 6, eaaz8809 (2020).
[4] K.-H. Ahn, et al., PRB. 99, 184432 (2019).
[5] M. Naka, et al., Nat. Commun. 10, 4305 (2019).
[6] L. Šmejkal, et al., PRX. 12, 011028 (2022).
[7] J. Matsuda, et al., PRL. 134, 226703 (2025).
In this work, we focus on conventional antiferromagnets that preserve time-reversal symmetry. We point out that such systems necessarily possess a finite Q vector, which leads to nontrivial symmetry breaking due to the incompatibility between Q vector and nonsymmorphic symmetry. Importantly, this nontrivial symmetry breaking gives rise to odd-parity responses originating from conventional antiferromagnetism [7]. Furthermore, we identify MnS₂ and YMn₂ as candidate materials for realizing such odd-parity responses in conventional antiferromagnets. In this study, we will discuss these findings based on a detailed theoretical framework employing spin space groups, as well as first-principles calculations that evaluate the Berry curvature dipole and shift current response in the candidate materials.
[1] L. Šmejkal, et al., PRX. 12, 040501 (2022).
[2] L. Šmejkal, et al., PRX. 12, 031042 (2022).
[3] L. Šmejkal, et al., Sci. Adv. 6, eaaz8809 (2020).
[4] K.-H. Ahn, et al., PRB. 99, 184432 (2019).
[5] M. Naka, et al., Nat. Commun. 10, 4305 (2019).
[6] L. Šmejkal, et al., PRX. 12, 011028 (2022).
[7] J. Matsuda, et al., PRL. 134, 226703 (2025).
*This work is supported by Grant-in-Aid for Scientific Research from JSPS, KAKENHI Grant No. JP23K13058(H.W.), No. JP24K00581 (H.W.), No. JP21H04990 (R.A.),JST-CREST No. JPMJCR23O4 (R.A.), JST-ASPIRE No. JPMJAP2317 (R.A.). This work was supported by the RIKENTRIP initiative (RIKEN Quantum, Advanced General Intelligence for Science Program, Many-body Electron Systems).
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Publication: J. Matsuda, et al., PRL. 134, 226703 (2025).
Presenters
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Jin Matsuda
- The University of Tokyo