Multiple reversals of vortex ratchet effects in a superconducting strip with inclined dynamic pinning landscape  

作　　者：An He Cun Xue 何安;薛存(College of Science,Chang'an University,Xi'an 710064,China;School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China;School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]College of Science,Chang'an University,Xi'an 710064,China [2]School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China [3]School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi'an 710072,China

出　　处：《Chinese Physics B》2020年第12期448-454,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11702034,11972298,and 11702218);the China Postdoctoral Science Foundation(Grant No.2019M663812);the Fundamental Research Funds for the Central Universities,China(Grant Nos.300102129104,3102018zy013,and 3102017jc01003);the Young Talent Fund of University Association for Science and Technology in Shaanxi,China(Grant Nos.20180503 and 20180501).

摘　　要：Using time-dependent Ginzburg-Landau formalism,we investigate the multiple reversals of ratchet effects in an unpatterned superconducting strip by the tilted dynamic pinning potential.In the case of collinear sliding potential and Lorentz force,vortices are always confined in the channels induced by sliding potential.However,due to the inclination angle of sliding pinning potential with respect to the Lorentz force,vortices could be driven out of the channels,and unexpected results with multiple reversals of vortex rectifications are observed.The mechanism of multiple reversals of vortex rectifications is explored by analyzing different vortex motion scenarios with increasing ac current amplitudes.The multiple reversals of transverse and longitudinal ratchet effects can be highly controlled by ac amplitude and dynamic pinning velocity.What's more,at certain large current the ratchet effect reaches strongest within a wide range of pinning sliding velocity.

关 键 词：multiple reversal ratchet effect dynamic pinning potential Lorentz force 

分 类 号：O357.1[理学—流体力学]