Theory of Orbital Kondo Effect with Assisted Hopping in Strongly Correlated Electron System.pdfVIP

Theory of Orbital Kondo Effect with Assisted Hopping in Strongly Correlated Electron Systems: Parquet Equations, Superconductivity and Mass Enhancement K. Penc 4 Institute de Physique, Universit´e de Neuchatel 9 9 1 1 Rue Breguet, CH-2000 Neuchˆatel, Switzerland n and a J 5 Research Institute for Solid State Physics 1 of the Hungarian Academy of Sciences 1 v 9 P.O.B. 49, H-1525 Budapest, Hungary 2 0 1 A. Zawadowski 0 4 9 Institute of Physics, Technical University of Budapest, / t a XI. Budafoki ut´ 8, H-1521 Budapest, Hungary m - and d n o Research Institute for Solid State Physics c : v of the Hungarian Academy of Sciences i X P.O.B. 49, H-1525 Budapest, Hungary r a (February 1, 2008) Abstract Orbital Kondo effect is treated in a model, where additional to the conduc- tion band there are localized orbitals close to the Fermi energy. If the hopping between the conduction band and the localized heavy orbitals depends on the occupation of the atomic orbitals in the conduction band then orbital Kondo correlation occurs. The noncommutative nature of the coupling required for 1 the Kondo effect is formally due to the form factors associated with the as- sisted hopp