Radiofrequency generation by coherently moving fluxons
Radiofrequency generation by coherently moving fluxons
复制标题
DOI：
10.1063/1.5028213
复制
发表时间：
2018-04-09
影响因子：
4
通讯作者：
Tsindlekht, M. I.
中科院分区：
文献类型：
--
作者：
Dobrovolskiy, O. V.;Sachser, R.;Tsindlekht, M. I.
第二类超导体中的Abrikosov涡旋晶格的特征在于垂直于所施加磁场的磁感应强度的周期性调制。对于在传输电流作用下的相干涡旋运动，在样品的给定点处的磁感应随时间变化，具有搓板频率f（wB）= v/d，其中v是涡旋速度，d是运动方向上涡旋之间的距离。在这里，通过使用频谱分析仪连接到一个50 nm宽的Au纳米线附近的超导Nb膜的表面的曲折，我们检测到的交流电压引起的相干移动磁通。电压在洗衣板频率f（WB）处达到峰值，并且其次谐波f（TOF）= f（WB）/5由天线宽度确定。通过扫描的直流电流值，我们发现，f（WB）可以从100 MHz到1.5 GHz的调谐，从而表明，图案化的正常金属/超导体纳米结构可以用作直流可调谐发电机在射频范围内工作。由AIP出版社出版。
A lattice of Abrikosov vortices in type II superconductors is characterized by a periodic modulation of the magnetic induction perpendicular to the applied magnetic field. For a coherent vortex motion under the action of a transport current, the magnetic induction at a given point of the sample varies in time with a washboard frequency f(wB) = v/d, where v is the vortex velocity and d is the distance between the vortices in the direction of motion. Here, by using a spectrum analyzer connected to a 50 nm-wide Au nanowire meander near the surface of a superconducting Nb film, we detect an ac voltage induced by coherently moving fluxons. The voltage is peaked at the washboard frequency, f(WB), and its subharmonics,f (TOF) = f(WB)/5, determined by the antenna width. By sweeping the dc current value, we reveal that f(WB) can be tuned from 100 MHz to 1.5 GHz, thereby demonstrating that patterned normal metal/superconductor nanostructures can be used as dc-tunable generators operating in the radiofrequency range. Published by AIP Publishing.