Interchain-Frustration-Induced Metallic State in Quasi-One-Dimensional Mott Insulators

TL;DR

This paper investigates how interchain frustration in a quasi-one-dimensional Mott insulator induces a metallic state, using a two-loop renormalization group approach to analyze the Hubbard model with competing interchain hoppings.

Contribution

It introduces a two-loop renormalization group analysis of the Hubbard model with two different interchain hoppings, revealing the emergence of metallicity due to interchain frustration.

Findings

Metallic state appears when both interchain hoppings exceed critical values.

Quasiparticle weight becomes finite and momentum-dependent in the metallic phase.

Temperature dependence of resistivity aligns with experimental observations.

Abstract

The mechanism that drives a metal-insulator transition in an undoped quasi-one-dimensional Mott insulator is examined in the framework of the Hubbard model with two different hoppings t_{perp 1} and t_{perp 2} between nearest-neighbor chains. By applying an N_{perp}-chain renormalization group method at the two-loop level, we show how a metallic state emerges when both t_{perp 1} and t_{perp 2} exceed critical values. In the metallic phase, the quasiparticle weight becomes finite and develops a strong momentum dependence. We discuss the temperature dependence of the resistivity and the impact of our theory in the understanding of recent experiments on half-filled molecular conductors.