Relativistic graphene ratchet on semidisk Galton board

Details Relativistic graphene ratchet on semidisk Galton board Relativistic graphene ratchet on semidisk Galton board

2010-10-21

arxiv.org/abs/1010.4441v2

Eur. Phys. J. B 79, 357-362 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures. Research done at Quantware http://www.quantware.ups-tlse.fr/. More detailed analysis is given

Scientific paper

10.1140/epjb/e2010-10893-1

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 in graphene. A comparison between usual two-dimensional electron gas (2DEG) and electrons in graphene shows that ratchet currents are comparable at very low temperatures. However, a large mean free path in graphene should allow to have a strong ratchet transport at room temperatures. Also in graphene the ratchet transport emerges even for unpolarized radiation. These properties open promising possibilities for room temperature graphene based sensitive photogalvanic detectors of microwave and terahertz radiation.

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