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A minimal description of strange metals
by Simone Fratini,
Intitut Néel, Grenoble
After reviewing recent exact numerical results on the transport and optical response of the t-J and Hubbard models, I will introduce a phenomenological theory of transport and optical properties of quantum materials that implements the Kubo formula starting from a minimal, physically motivated assumption on the motion of the charge carriers. In bad metals, where wave-like coherence is lost at each hop between neighboring atoms, this immediately leads to T-linear resistivities with apparently Planckian scattering rates. The theory also explains omega/T scaling, stretched Drude peaks and displaced Drude peaks that are commonly observed in optical absorption experiments in strange metals. I will briefly discuss direct consequences regarding the RIXS and M-EELS spectra in the cuprates, as well as broader implications of the present results for charge transport in quantum paraelectrics and relaxation processes in dielectrics.
Room Boreau, building C, 2nd floor, 10 rue Vauquelin, ESPCI