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Title:Bandwidth-Controlled Mott Transition: optical investigations on organic conductors
Time: 10:30 AM, Sep. 21, 2009
Room: D-210
Prof. Dr. Martin Dressel
Physikalisches Institut, Universitat Stuttgart, Germany
Abstract:Electronic interactions have a severe influence on the physics of two-dimensional electron systems. The 1/2-filled system k-(BEDT-TTF)2Cu[N(CN)2]BrxCl1-x is an example of a bandwidth-controlled Mott transition where the on-site Coulomb repulsion U/W is varied by increasing the bandwidth on substitution of Cl by Br. The conduction band is gapped due to electronic correlations for samples with high Cl content. When the Br-substitution increases, the samples become metallic at low temperatures and a Drude-like component in the conductivity develops due to the coherent quasiparticles. Eventually superconductivity evolves out of a Fermi-liquid ground state. The itinerant carriers exhibit strong renormalization effects as the metal-insulator transition is approached. A dynamical mean-field-theory treatment of the relevant Hubbard model gives a good quantitative description of the experimental data.

 

 

 

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