Institute of Physics, University of Silesia, Katowice, Poland.
J Phys Condens Matter. 2012 Feb 29;24(8):085702. doi: 10.1088/0953-8984/24/8/085702. Epub 2012 Jan 26.
We study transport properties of two Josephson junctions coupled by an external shunt resistance. One of the junctions (say, the first) is driven by an unbiased ac current consisting of two harmonics. The device can rectify the ac current yielding a dc voltage across the first junction. For some values of coupling strength, controlled by an external shunt resistance, a dc voltage across the second junction can be generated. By variation of system parameters such as the relative phase or frequency of two harmonics, one can conveniently manipulate both voltages with high efficiency, e.g. changing the dc voltages across the first and second junctions from positive to negative values and vice versa.
我们研究了由外部并联电阻耦合的两个约瑟夫森结的输运性质。其中一个结（例如，第一个结）由一个由两个谐波组成的无偏交流电流驱动。该器件可以对交流电流进行整流，在第一个结上产生直流电压。对于通过外部并联电阻控制的某些耦合强度值，可以在第二个结上产生直流电压。通过改变系统参数，例如两个谐波的相对相位或频率，可以方便地以高效率控制两个电压，例如将第一个和第二个结上的直流电压从正到负或反之改变。
