scholarly journals Numerical renormalization group calculations of the magnetization of Kondo impurities with and without uniaxial anisotropy

2013 ◽  
Vol 87 (18) ◽  
Author(s):  
Martin Höck ◽  
Jürgen Schnack
Keyword(s):  
Renormalization Group ◽  
Uniaxial Anisotropy ◽  
Numerical Renormalization Group ◽  
Kondo Impurities

scholarly journals Competition between the Soft Gap and the Molecular Kondo Singlets in Flat-band Lattices

2018 ◽  
Vol 28 (4) ◽  
pp. 361 ◽  
Author(s):  
Bo Duong Nguyen ◽  
Son Hong Nguyen ◽  
Tien Minh Tran
Keyword(s):  
Renormalization Group ◽  
Strong Coupling ◽  
Kondo Effect ◽  
Magnetic Impurity ◽  
Local Moment ◽  
Flat Band ◽  
Numerical Renormalization Group ◽  
Kondo Problem ◽  
Conduction Electrons ◽  
Lieb Lattice

The Kondo problem of a magnetic impurity embedded in the Lieb lattice is studied by the numerical renormalization group. The magnetic impurity hybridizes with conduction electrons from both the flat- and the soft-gap bands. We find a competition between the soft gap and the molecular Kondo singlet formations. The molecular Kondo effect occurs only when the magnetic impurity strongly hybridizes with conduction electrons at edge center sites of the Lieb lattice, and at the temperature range between the artificial strong coupling and the local moment regimes.

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