Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 52: Focus Session: Realistic Dynamical Mean-Field Approaches
40mm to Correlated Quantum Materials

TT 52.1: Hauptvortrag

Mittwoch, 9. März 2016, 15:00–15:30, H20

Hund’s Metals: a New Road to Strongly Correlated Electron Behavior — •Gabriel Kotliar — Rutgers University Piscataway NJ USA

Over the past thirty years, substantial effort has been devoted to describing materials near a Mott transition. In these systems, correlation effects (i.e. departures from free electron behavior) arise from strong on site repulsion (Hubbard U terms). Prototypical materials are V₂O₃. Recently attention has turned to a different origin of strong correlation phenomena which is rooted in the Hund’s coupling J term, starting with LDA+DMFT studies in the iron based high temperature superconductors and the ruthenium oxides. We will argue that Hund’s metals are well described by Dynamical Mean Field Theory, and are characterized by the phenomena of orbital spin separation[2,3]. We will present an elementary introduction to the theory of Hund’s metals stressing the experimental signatures which distinguishes them from materials near a Mott transition

[1] K. Haule and G. Kotliar, New J. Phys. 11, 025021 (2009).

[2] C. Aron and G. Kotliar, PRB 91, 041110 (2015).

[3] K. Stadler et. al., PRL 115, 136401 (2015)