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.

arXiv comment5 pages, 4 figures

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Cited by in corpus (45)

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• Metal-Insulator Transition in the Dimerized Organic Conductor $\kappa$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$Br
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• Electrodynamics of quantum spin liquids
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