The correlation-driven Mott transition is commonly characterized by a drop in resistivity across the insulator-metal phase boundary; yet, the complex permittivity provides a deeper insight into the microscopic nature. We investigate the frequency- and temperature-dependent dielectric response of the Mott insulator κ-(BEDT-TTF)2-Cu2(CN)3 when tuning from a quantum spin liquid into the Fermi-liquid state by applying external pressure and chemical substitution of the donor molecules. At low temperatures the coexistence region at the first-order transition leads to a strong enhancement of the quasi-static dielectric constant ϵ1 when the effective correlations are tuned through the critical value. Several dynamical regimes are identified around the Mott point and vividly mapped through pronounced permittivity crossovers. All experimental trends are captured by dynamical mean-field theory of the single-band Hubbard model supplemented by percolation theory.
@article{arxiv.1907.04437,
title = {Low-Temperature Dielectric Anomalies at the Mott Insulator-Metal Transition},
author = {A. Pustogow and R. Rösslhuber and Y. Tan and E. Uykur and M. Wenzel and A. Böhme and A. Löhle and R. Hübner and Y. Saito and A. Kawamoto and J. A. Schlueter and V. Dobrosavljević and M. Dressel},
journal= {arXiv preprint arXiv:1907.04437},
year = {2021}
}