Karl Franzens University Graz
Graz University of Technology
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Karl Franzens University Graz | Graz University of Technology | |
Correlations with drive - New phases and excitations in quantum materials Quantum materials governed by strong electron correlations are a fascinating playground for the discovery of new phases and phenomena. Heavy fermion compounds, one such materials class, are particularly versatile to explore them because their low and competing energy scales make them readily tunable by external control parameters. The observation that the quasiparticle mass, a measure of the correlation strength, can be driven towards divergences established the relation with quantum criticality. Here, exotic phenomena such as a strange metal state that violates the Fermi liquid paradigm and unconventional superconductivity that goes beyond the BCS framework are detected. Recently, by taking into account additional degrees of freedom and alternative interactions, a wealth of new directions is being explored. Highlights of our recent research include the observation of singular charge fluctuations at a magnetic quantum critical point [1], a sequential electron localization transition in a spin-orbital coupled system [2], and the discovery of a giant spontaneous Hall effect in a nonmagnetic Kondo-driven Weyl semimetal [3,4]. |