Gigahertz quantized charge pumping

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• Mr. Mark Blumenthal, Semiconductor Physics Group (Cavendish Laboratory)
• Monday 15 January 2007, 14:15-15:15
• Mott Seminar Room, Cavendish Laboratory, Department of Physics.

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I will discuss another pumping mechanism for single charges, which does not rely on Coulomb blockade of tunnelling. Single electrons are transported through a periodically formed decoupled quantum dot (QD). The electrons transported can be regarded as particles “surfing” on the time dependent potential of the well generated by the three barriers, rather than tunnelling through the barriers as waves. Two phase-shifted sinusoidal signals applied directly to the metallic finger gates on an etched GaAs/AlGaAs quantum wire, pump the electrons at frequencies of up to f = 3.4 GHz, corresponding to a current level of 0.54 nA. This approach represents an alternative path in the realization of a high current high accuracy quantum standard for electrical current

This talk is part of the Semiconductor Physics series.

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