Strange-like Metallicity in a Toy Model with Selective-Mottness

TL;DR

This paper uses dynamical mean-field theory to explore how the interplay of wide-band and flat-band states in a toy model leads to strange-metal behavior and unconventional superconductivity, resembling phenomena in cuprates and Fe-arsenides.

Contribution

It introduces a toy model capturing band interplay effects and demonstrates its relevance to strange-metal behavior and unconventional superconductivity, connecting to FL* and orthogonal Fermi liquids theories.

Findings

Good agreement with transport features in underdoped cuprates

Identification of a route to instability towards novel orders

Connection to FL* and orthogonal Fermi liquids theories

Abstract

The interplay between band and atomic aspects in materials with co-existing wide-band and flat-band states, or wide-band and effectively dispersionless electronic states is increasingly expected to lead to novel behavior. Using dynamical mean-field theory (DMFT), we investigate strange-metal-like behavior and emergence of unconventional superconductivity in a toy model that captures this interplay. Surprisingly, we find good accord with transport features seen in underdoped cuprates and ladder Fe-arsenides. We connect our findings to proposals of FL$^{*}$ and orthogonal Fermi liquids, and present a route to it's direct instability to novel, competing orders.