Atomic Altermagnets

Recently, altermagnetism [1] was experimentally demonstrated in the spin splitting of momentum space energy bands of materials such as MnTe [2] and CrSb [3], with two antiparallel spin sublattices. In this talk, I will show a pure form of d-wave altermagnetism in both direct and reciprocal space that can be achieved on a single atomic site without requiring an even number of antiparallel spin sublattices. We identified atomic altermagnetism and associated large spin splitting in Mott insulating octuplar order candidate using symmetry analysis and first-principles calculations. Our results demonstrate the correspondence of d-wave altermagnetic oder parameter in both direct and momentum space and extend the material candidates for altermagnetism to multipolar strongly spin-orbit coupled and correlated systems.

[1] L. Šmejkal et al., Physical Review X, 12, 031042 (2022)

[2] J. Krempasky et al., Nature, 626, 517 (2024)

[3] S. Reimers et al., Nature Communications, 15, 2116 (2024)