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Flat band tuned transient localization and non Fermi liquid signatures in Kagome materials

by Shashikant Singh Kunwar, Madhuparna Karmakar

Submission summary

Authors (as registered SciPost users):

Madhuparna Karmakar

Abstract

Taking cues from their recent experimental realizations, we report the low-temperature properties and thermal scales of Kagome materials, determined using the half-filled Kagome Hubbard model and a non-perturbative numerical approach. In contrast to the existing consensus, we establish a dynamically localized insulating phase in the weak coupling regime, arising from the localization of itinerant fermions by thermal bosons. This phase crosses over to a non-Fermi liquid metal at intermediate coupling. We provide a cogent theoretical understanding of the experimentally observed transport signatures in Kagome metals and, for the first time, map out the low-temperature phase diagram of this system. We conclusively demonstrate that, over a relevant temperature range, the suppression of charge transport due to the transient localization of fermions is a generic feature of strongly correlated quantum materials.

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