Powered by effective parquet nesting a commensurate chiral honeycomb superstructure in a trigonally packed transition metal dichalcogenide TaSe2 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.
@article{arxiv.1003.1976,
title = {Chiral honeycomb superstructure, parquet nesting, and Dirac cone formation in Cu-intercalated 2H-TaSe2},
author = {A. A. Kordyuk and D. V. Evtushinsky and V. B. Zabolotnyy and T. Haenke and C. Hess and B. Buechner and A. N. Yaresko and H. Berger and S. V. Borisenko},
journal= {arXiv preprint arXiv:1003.1976},
year = {2010}
}