Bad metallic transport in geometrically frustrated models

Abstract

We study the transport properties for a family of geometrically frustrated models on the triangular lattice with an interaction scale far exceeding the single-particle bandwidth. Starting from the interaction-only limit, which can be solved exactly, we analyze the transport and thermodynamic behavior as a function of filling and temperature at the leading non-trivial order in the single-particle hopping. Over a broad range of intermediate temperatures, we find evidence of a dc resistivity scaling linearly with temperature and with typical values far exceeding the quantum of resistance, $h/e^2$. At a sequence of commensurate fillings, the bad-metallic regime eventually crosses over into interaction induced insulating phases in the limit of low temperatures. We discuss the relevance of our results to experiments in cold-atom and moiré heterostructure based platforms.

37 pages, 11 figures; (v2) Final published version

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• Fermi-liquid instabilities at magnetic quantum phase transitions
• Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
• Abundance of correlated insulating states at fractional fillings of WSe${}_2$/WS${}_2$ moiré superlattices
• Supersolid hardcore bosons on the triangular lattice
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Cited by in corpus (4)

• Strange Metals from Melting Correlated Insulators in Twisted Bilayer Graphene
• Transport in the 2D Fermi-Hubbard Model: Lessons from Weak Coupling
• Superconductor--Insulator Transition in a non-Fermi Liquid
• Thermoelectric effect on diffusion in the two-dimensional Hubbard model