New Luttinger liquid physics from photoemission on Li$_{0.9}$Mo$_6$O$_{17}$

TL;DR

This study uses high-resolution photoemission spectroscopy to reveal novel Luttinger liquid behavior in Li$_{0.9}$Mo$_6$O$_{17}$, driven by charge neutral critical modes arising from its two-band structure.

Contribution

It demonstrates a new Luttinger liquid phenomenon linked to charge neutral modes in a two-band quasi-1D material, expanding understanding of correlated electron systems.

Findings

Renormalization of the Luttinger liquid density-of-states anomalous exponent.

Identification of charge neutral critical modes from the two-band structure.

Li$_{0.9}$Mo$_6$O$_{17}$ as a model for new Luttinger physics.

Abstract

Temperature dependent high resolution photoemission spectra of quasi-1 dimensional Li$_{0.9}$Mo$_6$O$_{17}$ evince a strong renormalization of its Luttinger liquid density-of-states anomalous exponent. We trace this new effect to interacting charge neutral critical modes that emerge naturally from the two-band nature of the material. Li$_{0.9}$Mo$_6$O$_{17}$ is shown thereby to be a paradigm material that is capable of revealing new Luttinger physics.