Wednesday, October 30, 2024 2:30pm to 3:20pm
About this Event
View mapJoin the Department of Physics and Astronomy on Wednesday, October 30 at 2:30pm in White Hall G09 for a colloquium presented by Turan Birol (University of Minnesota). The title of the talk is, "Altermagnets: A new phase of matter?" A reception will precede the colloquium at 2:00pm in White Hall 111.
Abstract
Even though there are accounts of ferromagnetic materials from 2500 years ago, the antiferromagnetic phase (where the spins of electrons in a solid order in a staggered fashion) has a much shorter history. More recently -just about 5 years ago- claims of a new magnetic phase dubbed "altermagnetism" has emerged. In this talk, I am going to use a combination of first principles quantum mechanical simulations (Density Functional Theory) and group theory based symmetry approaches to discuss what altermagnets are, and more importantly, what they are not. In particular, I will derive strict symmetry conditions related to magnetic multipoles to define an altermagnetic phase that is distinct from the antiferromagnetic one, and using DFT, show what effects this new phase has on the electronic structure. I will then discuss the unique macroscopic responses that altermagnets exhibit with a focus on piezomagnetic and magnetooptical properties.
Biography
Turan Birol received his PhD degree in Physics from the Cornell University in 2013, and worked as a postdoctoral research associate at the Condensed Matter Theory group in Rutgers University until he joined the department of Chemical Engineering and Materials Science at the University of Minnesota in 2016. His research interests lie on the intersection of condensed matter physics, structural chemistry, and materials science; and he uses first-principles computational tools (including density functional theory and dynamical mean field theory) to study and discover novel realizations of exotic phenomena in crystalline compounds, with a focus on transition metal oxides. He is currently a member of the University of Minnesota Materials Research Science and Engineering Center (MRSEC) and the Center for Quantum Materials (CQM), and received the ONR Young Investigator and NSF CAREER awards, as well as the University of Minnesota McKnight Assistant Professorship.
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