Untouched Nano-gear

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We have demonstrated the operation of a deterministic fluxon ratchet in a stack of 30 intrinsic Bi2Sr2CaCu2O8 Josephson junctions with the shape of a gear including 20 asymmetric teeth. It produces a pronounced rectified voltage at a 12 GHz drive frequency. As the plasma frequency can be as high as hundreds of GHz, the rectification frequencies as well as the operation frequencies of the superconducting gears can be up to sub-THz regime. Quite recently, we have also successfully fabricated electron-doped superconducting films Pr0.9LaCe0.1CuO4 (PLCCO) and investigated their transport properties for their applications in untouched gears. All the results suggest that the proposed untouched nano-gear can be realized with unique properties, though more efforts should be taken.