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

Bo Duong Nguyen; Son Hong Nguyen; Tien Minh Tran

doi:10.15625/0868-3166/28/4/13182

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

Bo Duong Nguyen, Son Hong Nguyen, Tien Minh Tran

Author affiliations

Authors

Bo Duong Nguyen 1Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi
Son Hong Nguyen Department of Occupational Safety and Health, Trade Union University, 169 Tay Son, Hanoi
Tien Minh Tran Institute of Physics, Vietnam Academy of Science and Technology, Hanoi

DOI:

https://doi.org/10.15625/0868-3166/28/4/13182

Keywords:

Kondo effect, numerical renormalization group, strongly correlated electron systems, flat band, soft gap

Abstract

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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Published

27-12-2018

How to Cite

[1]

B. D. Nguyen, S. H. Nguyen and T. M. Tran, Competition between the Soft Gap and the Molecular Kondo Singlets in Flat-band Lattices, Comm. Phys. 28 (2018) 361. DOI: https://doi.org/10.15625/0868-3166/28/4/13182.

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Vol. 28 No. 4 (2018)

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Papers

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