Vortex dynamics in two-dimensional Josephson junction arrays with asymmetrically bimodulated potential

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• 作者：Qing-Miao Nie^a ; ^{nieqingmiao@zjut.edu.cn} ; Sha-Sha Zhang^a ; Qing-Hu Chen^b ; ^c ; ^{qhchen@zju.edu.cn} ; Wei Zhou^c
• 关键词：Josephson junction arrays ; Voltage rectification ; Ratchet effect ; Resistively-shunted junction dynamics
• 刊名：Physics Letters A
• 出版年：2012
• 期刊代码：57_03759601
• 类别：ph
• 出版时间：19 March, 2012
• 卷：376
• 期：16
• 页码：1371-1374
• 文件大小：287 K

摘要

On the basis of resistively-shunted junction dynamics, we study vortex dynamics in two-dimensional Josephson junction arrays with asymmetrically single and bimodulated periodic pinning potential for the full range of vortex density f. The ratchet effect occurring at a certain range of temperature, current, and f, is observed in our simulation. We explain the microscopic behavior behind this effect by analyzing the vortex distribution and interaction. The reversal of the ratchet effect can be observed at several f values for a small driven current. This effect is stronger when the asymmetric potential is simultaneously introduced in two directions.