Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 19: CE: Quantum Impurities, Kondo Physics

TT 19.4: Talk

Monday, March 14, 2011, 19:30–19:45, HSZ 304

Molecular DMFT calculations of Co dimers in metal nanocontacts — •David Jacob — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06108 Halle, Germany

Using our recently developed Molecular Dynamical Mean-Field Theory method [1,2] we study the electronic structure and transport properties of two Co atoms suspended between the tips of a metal nanocontact. Due to the competition between Kondo screening of the magnetic moments of the two Co atoms by the conduction electrons and the mutual antiferromagnetic coupling between the Co atoms, the spectral density and the concomitant low-bias conductance spectrum strongly changes in dependence of the distance between the two Co atoms.
D. Jacob, K. Haule, and G. Kotliar, Phys. Rev. Lett. 103, 016803 (2009).
D. Jacob, K. Haule, and G. Kotliar, Phys. Rev. B 82, 195115 (2010).