We demonstrate unexpected occurrence of linear bands resembling Dirac cone at the zone-center of Au2Sn surface alloy with (2113) surface structure formed by deposition of about 0.9 ML Sn on Au(111) at elevated temperature. The surface exhibits an oblique symmetry with unequal lattice constants making it the first two dimensional surface alloy to exhibit Dirac cone with a non-honeycomb lattice.
@article{arxiv.1812.06508,
title = {Dirac cone in a non-honeycomb surface alloy},
author = {Pampa Sadhukhan and Dhanshree Pandey and Vipin Kumar Singh and Shuvam Sarkar and Abhishek Rai and Kuntala Bhattacharya and Aparna Chakrabarti and Sudipta Roy Barman},
journal= {arXiv preprint arXiv:1812.06508},
year = {2018}
}