High-efficiency deterministic Josephson vortex ratchet
High-efficiency deterministic Josephson vortex ratchet
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DOI：
10.1103/physrevlett.95.090603
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发表时间：
2005-08-26
影响因子：
8.6
通讯作者：
Koelle, D
中科院分区：
文献类型：
--
作者：
Beck, M;Goldobin, E;Koelle, D
我们在实验上研究了约瑟夫森涡旋棘轮--非对称周期势中的磁通子，它受时间平均为零的确定力驱动。通过电流注入器，在欠阻尼环形长约瑟夫森结中产生了高度不对称的周期性电势，使器件的效率高达91%。我们测量了不同光谱含量的驱动力的棘轮效应。对于单色高频驱动，整流电压变为量子化。在高驱动频率下，我们还观察到混沌、亚谐动力学和由于磁通子的惯性质量引起的电压反转。
We investigate experimentally a Josephson vortex ratchet-a fluxon in an asymmetric periodic potential driven by a deterministic force with zero time average. The highly asymmetric periodic potential is created in an underdamped annular long Josephson junction by means of a current injector providing an efficiency of the device up to 91%. We measured the ratchet effect for driving forces with different spectral content. For monochromatic high-frequency drive the rectified voltage becomes quantized. At high driving frequencies we also observe chaos, subharmonic dynamics, and voltage reversal due to the inertial mass of a fluxon.