Seminars & Lectures
|* TITLE||Hund metals: spin-orbital separation and orbital differentiation|
|* DATE / TIME||2021-04-12, 16.00-17.00|
|Hund metals are a broad class of multiorbital systems in which strong correlations are driven not only by Hubbard repulsion but also by Hund's rules. In this talk, I will address two hallmarks of Hund metals, brought by the Hund coupling. First, the energy scale of screening local spin fluctuations is much smaller than that for orbital fluctuations ("spin-orbital separation"). Exotic metallic phases, such as non-Fermi liquid and singular Fermi liquid, can appear in the spin-orbital separation energy window [1, 2]. Second, almost degenerate orbitals can have largely different behaviors ("orbital differentiation"); the orbital-selective Mott phase is one of its extrema . The interplay of spin-orbital separation and orbital differentiation leads to the small Fermi-liquid coherence scale of Sr2RuO4 .
 E. Walter, K. M. Stadler, S.-S. B. Lee*, Y. Wang, G. Kotliar, A. Weichselbaum, and J. von Delft, Phys. Rev. X 10, 031052 (2020).
 Y. Wang, E. Walter, S.-S. B. Lee, K. M. Stadler, J. von Delft, A. Weichselbaum, and G. Kotliar, Phys. Rev. Lett. 124, 136406 (2020).
 F. B. Kugler, S.-S. B. Lee, A. Weichselbaum, G. Kotliar, and J. von Delft, Phys. Rev. B 100, 115159 (2019).
 F. B. Kugler, M. Zingl, H. U. R. Strand, S.-S. B. Lee, J. von Delft, A. Georges, Phys. Rev. Lett. 124, 016401 (2020).
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