Quasiparticles at the verge of localization near the Mott metal-insulator transition in a two-dimensional material

Abstract

The dynamics of charge carriers close to the Mott transition is explored theoretically and experimentally in the quasi two-dimensional organic charge-transfer salt $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Br${}_x$Cl${}_{1-x}$, with varying Br content. The frequency dependence of the conductivity deviates significantly from simple Drude model behavior: there is a strong redistribution of spectral weight as the Mott transition is approached and with temperature. The effective mass of the quasiparticles increases considerably when coming close to the insulating phase. A dynamical mean-field-theory treatment of the relevant Hubbard model gives a good quantitative description of the experimental data.

5 pages, 4 figures

References in corpus (10)

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• Kinks in the dispersion of strongly correlated electrons
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• Doping Dependence of the Redistribution of Optical Spectral Weight in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
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Cited by in corpus (23)

• Electrodynamics of Correlated Electron Materials
• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• How bad metals turn good: spectroscopic signatures of resilient quasiparticles
• Absence of charge order in the dimerized κ-phase BEDT-TTF salts
• Non-Drude universal scaling laws for the optical response of local Fermi liquids
• Bad-metal behavior reveals Mott quantum criticality in doped Hubbard models
• Bandwidth-controlled Mott transition in kappa-(BEDT-TTF)2Cu[N(CN)2]Br{x}Cl{1-x}: Optical studies of correlated carriers
• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
• Power-law dependence of the optical conductivity observed in the quantum spin-liquid compound κ-(BEDT-TTF)2Cu2(CN)3
• Study of the Hubbard model on the triangular lattice using dynamical cluster approximation and dual fermion methods
• Optical probe of carrier doping by X-ray irradiation in organic dimer Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2]$Cl
• Absence of a quantum limit to charge diffusion in bad metals
• On infrared pseudogap in cuprate and pnictide high-temperature superconductors
• Metal-Insulator Transition in the Dimerized Organic Conductor $\kappa$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$Br
• Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition
• DC and high-frequency conductivity of the organic metals beta"-(BEDT-TTF)2SF5RSO3 (R = CH2CF2 and CHF)
• Pinball liquid phase from Hund's coupling in frustrated transition metal oxides
• Superconductivity and Mottness in Organic Charge Transfer Materials
• Transition of a prestine Mott insulator to a correlated Fermi liquid: Pressure-dependent optical investigations of a quantum spin liquid
• Bad topological semimetals in layered honeycomb compounds
• Enhancement of the thermal expansion of organic charge transfer salts by strong electronic correlations
• Possible observation of the signature of the bad metal phase and its crossover to a Fermi liquid in K(BEDT-TTF)2Cu(NCS)2 bulk and nanoparticles by Raman scattering
• Electronic properties of the dimerized organic conductor $\kappa$-(BETS)${}_2$Mn[N(CN)${}_2$]${}_3$