Abstract
The directed electron transport, driven by external linear-polarized microwave irradiation, in a two-dimensional spatially periodic asymmetrical system called “ratchet” has been studied experimentally. 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 semidiscs-shaped scatterers (antidots). A directed electric current of few μ A was observed in the “ratchet” antidot lattice under microwave irradiation (of few μ W ) in the absence of any external current applied to the sample. The signal was recorded as a function of magnetic field, temperature, microwave power and polarization.
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