Relativistic graphene ratchet on semidisk Galton board
Résumé
Using extensive Monte Carlo simulations we study numerically and analytically a photogalvanic effect, or ratchet, of directed electron transport induced by a microwave radiation on a semidisk Galton board of antidots. A comparison between usual two-dimensional electron gas (2DEG) and electrons in graphene shows an enhancement of ratchet current in graphene by two to three orders of magnitude. This enhancement opens promising possibilities for room temperature graphene based sensitive photogalvanic detectors of microwave and terahertz radiation.