Basic study on ultra low-power electron transport in compound semiconductor one-dimensional Brownian ratchet

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Electron Brownian ratchet device generates coherent current from randomly moving electrons, whose mechanism is inspired by the molecular level process of the mechanical motion in the biological systems. The purpose of this project is to create the electron Brownian ratchet device using a GaAs-based nanowire with multiple asymmetric gates and to demonstrate the current generation. We designed the device on the basis of 3D potential simulation and fabricated it. We succeeded in generation of coherent current by flashing ratchet operation at room temperature. This was the first achievement in the semiconductor-based Brownian ratchet devices.