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Oct 19 2023

Condensed Matter Seminar-“Harnessing DMFT: recent advances in Hund Metal Research” with Prof. Sangkook Choi

Physics Seminar

October 19, 2023

10:00 AM - 11:00 AM


SES 2214

Physics Seminar

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].

[1] S. Ryee, M. J. Han, and S. Choi, Phys. Rev. Lett. 126, 206401 (2021).
[2] S. Ryee, P. Sémon, M. J. Han, and S. Choi, npj Quantum Mater. 5, 1 (2020).
[3] S. Ryee, S. Choi, and M. J. Han, Phys. Rev. Research 5, 033134 (2023).
[4] B. Kang, C. Melnick, P. Semon, S. Ryee, M. J. Han, G. Kotliar, and S. Choi, Npj Quantum Mater. 8, 1 (2023).
[5] S. Choi, P. Semon, B. Kang, A. Kutepov, and G. Kotliar, Comp. Phys. Comm. 244, 277 (2019)
[6] S. Choi, A. Kutepov, K. Haule, M. van Schilfgaarde, and G. Kotliar, npj Quantum Materials 1, 16001 (2016)
[7] B. Kang, P. Semon, C. Melnick, G. Kotliar, and S. Choi, arXiv:2310.04613.


Physics Office

Date posted

Oct 17, 2023

Date updated

Oct 17, 2023