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TT: Fachverband Tiefe Temperaturen

TT 2: Correlated Electrons: Electronic Structure Calculations and Other Theoretical Topics

TT 2.12: Talk

Monday, April 1, 2019, 12:30–12:45, H7

A Fractionalized Metal in a Falicov-Kimball Model — •Martin Hohenadler and Fakher Assaad — Universität Würzburg

Quantum Monte Carlo simulations are used to reveal two different metallic regimes in a 2D spinful Falicov-Kimball model with a three-body interaction. For weak to intermediate coupling, gapless single-particle excitations are consistent with a Fermi liquid. In contrast, for strong coupling, metallic behavior is observed despite the absence of quasiparticles. This regime can be understood using the concepts of orthogonal metals and fractionalization. Interesting connections to lattice-gauge and slave-spin theories are highlighted.