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

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

2008-02-28

arxiv.org/abs/0802.4250v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.78.045431

We report on experimental evidence of directed electron transport, induced by external linear-polarized microwave irradiation, in a two-dimensional spatially-periodic asymmetrical system called ratchet. The broken spatial symmetry was introduced in a high mobility two-dimensional electron gas based on AlGaAs/GaAs heterojunction, by patterning an array of artificial semi-discs-shaped antidots. We show that the direction of the transport is efficiently changed by microwave polarization. The dependence of the effect on magnetic field and temperature is investigated. This represents a significant step towards the realization of new microwave detectors and current generators.

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