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., vol. 28, no. 4, p. 361, Dec. 2018.

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Section

Papers
Received 07-10-2018
Accepted 05-11-2018
Published 27-12-2018