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We report on experimental evidence of directed electron transport, induced byexternal linear-polarized microwave irradiation, in a two-dimensionalspatially-periodic asymmetrical system called ratchet. The broken spatialsymmetry was introduced in a high mobility two-dimensional electron gas basedon AlGaAs/GaAs heterojunction, by patterning an array of artificialsemi-discs-shaped antidots. We show that the direction of the transport isefficiently changed by microwave polarization. The dependence of the effect onmagnetic field and temperature is investigated. This represents a significantstep towards the realization of new microwave detectors and current generators.

Experimental investigation of the ratchet effect in a two-dimensional electron system with broken spatial inversion symmetry