منابع مشابه
Mobility Edges and Anderson Transitions
When the Anderson Hamiltonian for independent electrons in a disordered solid is represented in a basis of extended wave functions, its matrix elements take definite values rather than distributions of values because they become averages over infinite numbers of independent site-energies. As a result of this averaging, there is a band of extended states whose width increases with disorder, but ...
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R. Dong,1 J. Otsuki,2,3 and S. Y. Savrasov1 1Department of Physics, University of California, Davis, California 95616, USA 2Department of Physics, Tohoku University, Sendai 980-8578, Japan 3Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany (Received 19 November 2012; revised manuscript received 19 F...
متن کاملAnderson-Yuval approach to the multichannel Kondo problem.
We analyze the structure of the perturbation expansion of the general multichannel Kondo model with channel anisotropic exchange couplings and in the presence of an external magnetic field, generalizing to this case the AndersonYuval technique. For two channels, we are able to map the Kondo model onto a generalized resonant level model. Limiting cases in which the equivalent resonant level mode...
متن کاملKondo destruction and valence fluctuations in an Anderson model.
Unconventional quantum criticality in heavy-fermion systems has been extensively analyzed in terms of a critical destruction of the Kondo effect. Motivated by a recent demonstration of quantum criticality in a mixed-valent heavy-fermion system, β-YbAlB(4), we study a particle-hole-asymmetric Anderson impurity model with a pseudogapped density of states. We demonstrate Kondo destruction at a mix...
متن کاملCollective Kondo effect in the Anderson–Hubbard lattice
The periodic Anderson model is extended by switching on a Hubbard U for the conduction electrons. We use the Gutzwiller variational method to study the nearly integral valent limit. The lattice Kondo energy contains the U-dependent chemical potential of the Hubbard subsystem in the exponent, and the correlation-induced band narrowing in the prefactor. Both effects tend to suppress the Kondo sca...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2012
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.85.115112