Title: Microscopic Models for Altermagnetism
When: Friday, November 22, 2024, 12:00
Place: Department of Condensed Matter Physics, Faculty of Sciences, Module 3, Seminar Room (5th Floor)
Speaker: Mercè Roig I Server, University of Copenhagen, Denmark.
Altermagnetism has been recently proposed as a new magnetic phase that has a vanishing net magnetization, like antiferromagnets, but exhibits time-reversal symmetry breaking and momentum-dependent spin-split band structure, akin to ferromagnets. In this talk, I will give an introduction to altermagnetism, discussing possible material candidates and applications for this recently recognized magnetic order. Most existing theoretical research stems from density functional theory (DFT). Here I will present our recent progress [1] on developing realistic minimal models for altermagnetism reproducing DFT electronic bandstructures for material candidates including the rutile RuO2. Then, I turn to the interplay between the anomalous Hall effect and the magnetization in altermagnets , where we develop the Landau free energy expansion for altermagnetism from the microscopic models.
References
- M. Roig, A. Kreisel, Y. Yu, B. M. Andersen, and D. F. Agterberg, Phys. Rev. B 110, 144412 (2024)
