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A bilayer electron system in a strong magnetic field at low temperatures,with total Landau level filling factor nu =1, can enter a strongly coupledphase, known as the (111) phase or the quantum Hall pseudospin-ferromagnet. Inthis phase there is a large quantized Hall drag resistivity between the layers.We consider here structures where regions of (111) phase are separated byregions in which one of the layers is depleted by means of a gate, and variousof the regions are connected together by wired contacts. We note that withsuitable designs, one can create a DC step-up transformer where the outputvoltage is larger than the input, and we show how to analyze the current flowsand voltages in such devices

physical review. b, condensed matter

dc voltage step-up transformer based on a bilayer<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mn /></mml:math>quantum Hall system

dc voltage step-up transformer based on a bilayerν=1quantum Hall system