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

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

2007-11-21

arxiv.org/abs/0711.3307v1

Phys. Rev. Lett. 100, 086404 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.086404

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.

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