Tunable Weyl Points in Periodically Driven Nodal Line Semimetals
  Weyl semimetals and nodal line semimetals are characterized by linear band touching at zero-dimensional points and one-dimensional lines, respectively. We predict that a circularly polarized light drives nodal line semimetals into Weyl semimetals. The Floquet Weyl points thus obtained are tunable by the incident light, which enables investigations of them in a highly controllable manner. The transition from nodal line semimetals to Weyl semimetals is accompanied by the emergence of a large and tunable anomalous Hall conductivity. Our predictions are experimentally testable by transport measurement in film samples or by pump-probe angle-resolved photoemission spectroscopy. 
Zhongbo Yan and Zhong Wang
cond-mat.str-el cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.quant-gas physics.optics