Tunable point nodes from line-node semimetals via application of light

Abstract

We propose that illumination with light provides a useful platform for creating tunable semimetals. We show that by shining light on semimetals with a line degeneracy, one can convert them to a point-node semimetal. These point nodes are adjustable, and their position can be controlled by simply rotating the incident light beam. We also discuss the implications of this change in Fermi-surface topology as manifested in transport observables.