We propose that a Floquet Weyl semimetal state can be induced in three-dimensional topological insulators, either nonmagnetic or magnetic, by the application of off-resonant light. The virtual photon processes play a critical role in renormalizing the Dirac mass and so resulting in a topological semimetal with vanishing gap at Weyl points. The present mechanism via off-resonant light is quite different from that via on-resonant light, the latter being recently suggested to give rise to a Floquet topological state in ordinary band insulators.
@article{arxiv.1308.4266,
title = {Floquet Weyl Semimetal Induced by Off-Resonant Light},
author = {Rui Wang and Baigeng Wang and Rui Shen and L. Sheng and D. Y. Xing and Sergey Y. Savrasov},
journal= {arXiv preprint arXiv:1308.4266},
year = {2015}
}