Condensed Matter Seminar-“Harnessing DMFT: recent advances in Hund Metal Research” with Prof. Sangkook Choi
October 19, 2023
10:00 AM - 11:00 AM
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Title: “Harnessing DMFT: recent advances in Hund Metal Research”
Abstract: The on-site Hund coupling J has been a focal point of research in electron correlation for the past 15 years. It leads to the emergence of a Hund metal, a correlated metallic regime that occurs in multiorbital systems away from half-filling. This system is characterized by electron correlation promoted by J rather than proximity to a Mott insulator, resulting in a range of physical phenomena such as spin-freezing crossover, spin-orbital separation, orbital differentiation, and superconductivity.
In this talk, we will provide an overview of the Hund metallic phase and highlight our recent discoveries in the field [1-4]. These include the existence of Hund metals in two orbital systems, an enhancement of charge-order instability in the Hund metallic regime, and key experimental signatures of Hund metal. We will also introduce recent advances in ab initio DMFT methodology developments targeting correlated quantum materials[5-7].
 S. Ryee, M. J. Han, and S. Choi, Phys. Rev. Lett. 126, 206401 (2021).
 S. Ryee, P. Sémon, M. J. Han, and S. Choi, npj Quantum Mater. 5, 1 (2020).
 S. Ryee, S. Choi, and M. J. Han, Phys. Rev. Research 5, 033134 (2023).
 B. Kang, C. Melnick, P. Semon, S. Ryee, M. J. Han, G. Kotliar, and S. Choi, Npj Quantum Mater. 8, 1 (2023).
 S. Choi, P. Semon, B. Kang, A. Kutepov, and G. Kotliar, Comp. Phys. Comm. 244, 277 (2019)
 S. Choi, A. Kutepov, K. Haule, M. van Schilfgaarde, and G. Kotliar, npj Quantum Materials 1, 16001 (2016)
 B. Kang, P. Semon, C. Melnick, G. Kotliar, and S. Choi, arXiv:2310.04613.
Oct 17, 2023
Oct 17, 2023