Effective model for electronic properties of the quasi one-dimensional purple bronze Li0.9Mo6O17 based on ab-initio calculations

TL;DR

This paper develops an effective electronic model for Li0.9Mo6O17 based on ab-initio calculations, capturing its anisotropic properties and electron interactions, and aligns well with experimental data.

Contribution

It introduces a novel four-orbital effective model derived from ab-initio calculations, incorporating electron-electron interactions and matching experimental observations.

Findings

High anisotropy in transport properties consistent with experiments

Good agreement with photo emission data when including moderate electron interactions

Model provides a basis for studying low-energy Luttinger liquid behavior

Abstract

We investigate the electronic structure of the strongly anisotropic, quasi low dimensional purple bronze Li0.9Mo6O17. Building on all-electron ab-initio band structure calculations we obtain an effective model in terms of four maximally localized Wannier orbitals, which turn out to be far from atomic like. We find two half-filled orbitals arranged in chains running along one crystallographic direction, and two full orbitals in perpendicular directions, respectively. The possibility to reduce this model to only two orbitals forming two chains per unit cell with inter-chain coupling is discussed. Transport properties of these models show high anisotropy, reproducing trends of the experimentally determined values for the dc conductivity. We also consider basic effects of electron-electron interactions using the (extended) Variational Cluster Approach and Dynamical Mean Field Theory. We find good agreement with experimental photo emission data upon adding moderate on-site interaction of the order of the band width to the ab-initio derived tight-binding Hamiltonian. The obtained models provide a profound basis for further investigations on low-energy Luttinger liquid properties or to study electronic correlations within computational many-body theory.