Critical Slowing Down of the Charge Carrier Dynamics at the Mott Metal-Insulator Transition

Abstract

We report on the dramatic slowing down of the charge carrier dynamics in a quasi-two-dimensional organic conductor, which can be reversibly tuned through the Mott metal-insulator transition (MIT). At the finite-temperature critical endpoint we observe a divergent increase of the resistance fluctuations accompanied by a drastic shift of spectral weight to low frequencies, demonstrating the critical slowing down of the order parameter (doublon density) fluctuations. The slow dynamics is accompanied by non-Gaussian fluctuations, indicative of correlated charge carrier dynamics. A possible explanation is a glassy freezing of the electronic system as a precursor of the Mott MIT.

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• Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures
• Charge glass in an extended dimer Hubbard model
• Temperature dependent anisotropy and two-band superconductivity revealed by lower critical field in organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Br
• Universal Anomaly of Dynamics at Phase Transition Points Induced by Pancharatnam-Berry Phase
• The Sub-Exponential Critical Slowing Down at Floquet Time Crystal Phase Transition