Floquet Weyl semimetal induced by off-resonant light
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, China
Received: 14 November 2013
Accepted: 3 January 2014
We propose that a Floquet Weyl semimetal state can be induced in three-dimensional topological insulators, either non-magnetic 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.
PACS: 73.20.At – Surface states, band structure, electron density of states / 73.43.Nq – Quantum phase transitions / 03.65.Vf – Phases: geometric; dynamic or topological
© EPLA, 2014