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THU: Thursday Contributed Sessions
THU 8: Frustrated Quantum Systems: Contributed Session to Symposium
THU 8.1: Talk
Thursday, September 11, 2025, 14:15–14:30, ZHG009
Stretched Drude response in doped Mott insulators: Peculiar charge dynamics in molecular quantum spin liquids — Savita Priya1, •Martin Dressel1, and Simone Fratini2 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2Néel Institute - CNRS and Université Grenoble Alpes, Grenoble, France
Among the extensively studied class of low-dimensional molecular quantum-spin-liquid compounds κ-(BEDT-TTF)4Hg2.89Br8 is of particular interest because the incommensurate anion layer results in a extraordinary charge transfer: the strongly correlated system remains metallic down to the superconducting transition. Our comprehensive investigations of its optical properties reveal a peculiar charge dynamics and show that the strange-metal behavior in the resistivity is tightly related to a stretched Drude response in the optical conductivity, i.e. a generalized form of the Drude absorption representing a stretched exponential relaxation. Our study may help to solve the longstanding puzzle of unusual metallic properties frequently observed in high-Tc cuprate and other transition metal oxides.
We thank our collaborators: J. Liebman, N. Drichko, K. Kanoda, H. Taniguchi, T. Kobayashi, J. Ovčar, I. Lončarić
Keywords: Strongly correlated metals; quantum spin liquids; optical properties; electrodynamics