Kondo lattice mediated interactions in flat-band systems

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Abstract

Electronic flat bands represent a paradigmatic platform to realize strongly correlated matter due to their associated divergent density of states. In common instances, including electron-electron interactions leads to magnetic instabilities for repulsive interactions and superconductivity for attractive interactions. Nevertheless, interactions of a Kondo nature in flat-band systems have remained relatively unexplored. Here we address the emergence of interacting states mediated by Kondo lattice coupled to a flat-band system. Combining dynamical mean-field theory and tensor networks methods to solve flat-band Kondo lattice models in one and two dimensions, we show the emergence of a robust underscreened regime leading to a magnetically ordered state in the flat band. Our results put forward flat-band Kondo lattice models as a platform to explore the genuine interplay between flat-band physics and many-body Kondo screening.
Original languageEnglish
Article number043113
Pages (from-to)1-9
Number of pages9
JournalPHYSICAL REVIEW RESEARCH
Volume3
Issue number4
DOIs
Publication statusPublished - Dec 2021
MoE publication typeA1 Journal article-refereed

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