Chiral honeycomb superstructure, parquet nesting, and Dirac cone formation in Cu-intercalated 2H-TaSe2

TL;DR

This paper investigates how parquet nesting induces a chiral honeycomb superstructure in Cu-intercalated 2H-TaSe2, leading to Dirac cone features, but scattering effects hinder the formation of a well-defined Dirac point.

Contribution

It reveals the role of parquet nesting in creating superstructures and Dirac cones in transition metal dichalcogenides, highlighting scattering effects that influence their electronic properties.

Findings

Parquet nesting induces a chiral honeycomb superstructure.

Dirac cone anomalies are observed in the excitation spectrum.

Scattering on 2D plasmons hinders Dirac point formation.

Abstract

Powered by effective parquet nesting a commensurate chiral honeycomb superstructure in a trigonally packed transition metal dichalcogenide TaSe$_2$ results in a Dirac cone anomaly in one-particle excitation spectrum. However, the formation of the well defined Dirac point seems to be hindered by effective scattering on 2D plasmons.