DMFT-QE Symposium: February 5

Talk 1:

Fermi Surface Expansion above Critical Temperature in Ferromagnets: A cDMFT and DΓA Study

Ryotaro Arita, Research Center for Advanced Science and Technology, The University of Tokyo and RIKEN Center for Emergent Matter Science

Using a cluster and diagrammatic extension of the dynamical mean-field theory, we study the single- and two-orbital Hubbard models with strong ferromagnetic (FM) spin fluctuations. We find a significant expansion of the Fermi surface (FS) above the Curie temperature (Tc). While it is natural to see a volume expansion of the majority-spin FS in the FM long-range-ordered metal below Tc, we find a similar spectrum even above Tc in the strong-coupling regime with the large preformed local moment [1,2].

[1] Y. Nomura, S. Sakai and R. Arita, PRL 128 206401 (2022)
[2] M. Kitatani et al., in prep.

Talk 2:

Simulating Correlation Effects in Quasi-2D Materials

Jan M. Tomczak, Department of Physics, King’s College London and Institute of Solid-State Physics, TU Wien

[1] M. Pickem, J. Kaufmann, K. Held, JMT, Phys. Rev. B 2, 024307 (2021)
[2] Z. Zhong et al, Phys. Rev. Lett. 114, 246401 (2015)
[3] M. Pickem, JMT, K. Held, Phys. Rev. Research 4, 033253 (2022)
[4] E.G.C.P. van Loon et al, npj 2D Materials and Applications 7, 47 (2023)