Mott transition in two-dimensional frustrated compounds

TL;DR

This paper investigates the Mott metal-insulator transition in two-dimensional frustrated compounds using cluster dynamical mean field theory, revealing reentrant behavior due to geometric frustration and aligning well with experimental observations.

Contribution

It demonstrates how partial geometric frustration induces reentrant Mott transition behavior in anisotropic triangular lattices, advancing understanding of correlated electron systems.

Findings

Reentrant behavior in anisotropic lattices due to frustration

Good agreement with experimental phase diagrams

Short-range correlations influence phase transitions

Abstract

The phase diagrams of isotropic and anisotropic triangular lattices with local Coulomb interactions are evaluated within cluster dynamical mean field theory. As a result of partial geometric frustration in the anisotropic lattice, short range correlations are shown to give rise to reentrant behavior which is absent in the fully frustrated isotropic limit. The qualitative features of the phase diagrams including the critical temperatures are in good agreement with experimental data for the layered organic charge transfer salts kappa-(BEDT-TTF)_2Cu[N(CN)_2]Cl and kappa-(BEDT-TTF)_2Cu_2(CN)_3.