The stability of germanene under biaxial tensile strain and the accompanying modifications of the electronic properties are studied by density functional theory. The phonon spectrum shows that up to 16% strain the germanene lattice is stable, where the Dirac cone shifts towards higher energy and hole-doped Dirac states are achieved. The latter is due to weakening of the Ge-Ge bonds and reduction of the s-p hybridization. Our calculated Gr\"uneisen parameter shows a similar dependence on the strain as reported for silicene (which is different from that of graphene).
@article{arxiv.1311.2807,
title = {Stability of germanene under tensile strain},
author = {T. P. Kaloni and U. Schwingenschlögl},
journal= {arXiv preprint arXiv:1311.2807},
year = {2013}
}