Non-fermi-liquid single particle lineshape of the quasi-one-dimensional non-CDW metal Li_{0.9}Mo_{6}O_{17} : comparison to the Luttinger liquid

TL;DR

This paper investigates the non-Fermi liquid lineshape of the Fermi surface in Li_{0.9}Mo_{6}O_{17}, revealing similarities and differences with Luttinger liquid theory, suggesting an electronic origin of NFL behavior.

Contribution

It provides a detailed experimental comparison of the NFL lineshape in Li_{0.9}Mo_{6}O_{17} with Luttinger liquid predictions, highlighting key similarities and differences.

Findings

Identified NFL lineshape of the Fermi surface in Li_{0.9}Mo_{6}O_{17}

Found significant similarities to Luttinger liquid behavior

Detected important differences from ideal Luttinger liquid predictions

Abstract

We report the detailed non-Fermi liquid (NFL) lineshape of the dispersing excitation which defines the Fermi surface (FS) for quasi-one-dimensional Li_{0.9}Mo_{6}O_{17}. The properties of Li_{0.9}Mo_{6}O_{17} strongly suggest that the NFL behavior has a purely electronic origin. Relative to the theoretical Luttinger liquid lineshape, we identify significant similarities, but also important differences.