Phases of matter are classified according to order parameters and corresponding symmetries. For instance, water exhibits rotational symmetry, while ice breaks it. We have recently classified magnets by spin symmetries. We have found out that, remarkably, there exists yet third magnetic ordering in addition to the more common antiferromagnetic and ferromagnetic orderings. The unconventional altermagnetic ordering is characterised by an unconventional time-reversal symmetry breaking in the form of alternating spin order in reciprocal space which originates from anisotropic and mutually rotated opposite spin densities in direct space. Altermagnets are predicted a plethora of effects both of fundamental and applied interest such as dissipationless and spin-polarised currents, some of which were already indicated in experiments.
Our team is currently investigating altermagnetism and topological antiferromagnetic spintronics with our collaborators from Prague, Mainz, Washington, Barranquilla, Kaiserslautern, Frankfurt, Karlsruhe, Dresden, Grenoble, Nottingham, Vienna, and Pilsen.
Current interests of our team:
- Altermagnetism Perspective .
- Topological Antiferromagnetic Spintronics Review .
- Anomalous Hall effects Review .
- Magnetoresistance effects Prediction of unconventional giant magnetoresistance .
- Unconventional magnetism Prediction .
- Axion matter Dark Matter Detection .
- “Beyond Conventional Ferromagnetism and Antiferromagnetism: A Phase with Nonrelativistic Spin and Crystal Rotation Symmetry”. L. Šmejkal, J.Sinova, and T. Jungwirth
- “An anomalous Hall effect in altermagnetic ruthenium dioxide”. Zexin Feng*, Xiaorong Zhou*, Libor Šmejkal*, Lei Wu, Zengwei Zhu, Huixin Guo, Rafael González-Hernández, Xiaoning Wang, Han Yan, Peixin Qin, Xin Zhang, Haojiang Wu, Hongyu Chen, Ziang Meng, Li Liu, Zhengcai Xia, Jairo Sinova, Tomáš Jungwirth, and Zhiqi Liu
- “Crystal time-reversal symmetry breaking and spontaneous Hall effect in collinear antiferromagnets.”. L. Šmejkal, González-Hernández, R., T. Jungwirth, and J. Sinova
- “Topological antiferromagnetic spintronics”. Šmejkal, L., Mokrousov, Y., Yan, B. & MacDonald, A. H.
- "Proposal to Detect Dark Matter using Axionic Topological Antiferromagnets". David J. E. Marsh, Kin Chung Fong, Erik W. Lentz, Libor Šmejkal, and Mazhar N. Ali
Further interests - solid state theory of relativistic effects: