Photocurrents in Weyl semimetals

The generation of photocurrent in an ideal two-dimensional Dirac spectrum is\nsymmetry-forbidden. In sharp contrast, we show that three-dimensional Weyl\nsemimetals can generically support significant photocurrent generations due to\nthe combination of inversion symmetry breaking and finite tilts of the Weyl\nspectra. Symmetry properties, chirality relations and various dependences on\nthe system and light sources are explored in details. Our results suggest that\nnoncentrosymmetric Weyl materials can be advantageously applied to room\ntemperature detections of mid- and far-infrared radiations.\n