The dynamics of a one-dimensional, highly discrete, linear array of alternating $0-$ and $π-$ Josephson junctions is studied numerically, under constant bias current at zero magnetic field. The calculated current - voltage characteristics exhibit half-integer and integer zero-field-like steps for even and odd total number of junctions, respectively. Inspection of the instantaneous phases reveals that, in the former case, single $π-$kink excitations (discrete semi-fluxons) are supported, whose propagation in the array gives rise to the $1/2-$step, while in the latter case, a pair of $π-$kink -- $π-$antikink appears, whose propagation gives rise to the $1-$step. When additional $2π-$kinks are inserted in the array, they are subjected to fractionalization, transforming themselves into two closely spaced $π-$kinks. As they propagate in the array along with the single $π-$kink or the $π-$kink - $π-$antikink pair, they give rise to higher half-integer or integer zero-field-like steps, respectively.
We present a theoretical study of the quantum dynamics of \textit{two} magnetic fluxons (MFs) trapped in Josephson junction parallel arrays (JJPAs) with large kinetic inductances. The Josephson phase distribution of two trapped MFs satisfies a topological constraint, i.e., a total variation of Josephson phases along a JJPA is $4π$. In such JJPAs the characteristic length of Josephson phase distribution ("the size" of MF) is drastically reduced to be less than a single cell size. Two extreme dynamic patterns will be distinguished: two weakly interacting MFs and two merged MFs, i.e., a $4π$-kink…
Dynamic states offer extended possibilities to control the properties of quantum matter. Recent efforts are focused on studying the ordered states which appear exclusively under the time-dependent drives. Here we demonstrate a class of systems which feature dynamic spin-triplet superconducting order stimulated by the alternating electric field. The effect is based on the interplay of ferromagnetism, interfacial spin-orbital coupling (SOC) and the condensate motion driven by the field, which converts hidden static p-wave order, produced by the joint action of the ferromagnetism and the SOC, int…
We investigate macroscopic behaviors of fluctuating domain walls in nonequilibrium open systems with the help of the effective field theory based on symmetry. Since the domain wall in open systems breaks the translational symmetry, there appears a gapless excitation identified as the Nambu-Goldstone (NG) mode, which shows the non-propagating diffusive behavior in contrast to those in closed systems. After demonstrating the presence of the diffusive NG mode in the $(2+1)$-dimensional dissipative Josephson junction, we provide a symmetry-based general analysis for open systems breaking the one-d…
Edge critical currents of dense Josephson vortex lattice in layered superconductors
本文计算了沿原子层超导体层施加大磁场$B$所产生的稠密约瑟夫森涡旋晶格的临界电流随场的变化关系。在干净的样品中，由于晶格与边界的相互作用，出现有限的临界电流。边界引起晶格的交替变形，在典型长度处在样品内部衰减，该典型长度大于约瑟夫森长度并且与磁场成比例地增加。这种变形的确切形状和沿表面流动的总电流由晶格在体块中的位置唯一地确定。总的最大约瑟夫森电流具有强振荡的整体1/B依赖性。与公知的夫琅和费依赖性相反，振荡周期对应于添加\emph{one flux quantum per two junctions}。由于与边界的相互作用，慢晶格运动的磁通流电压也随场振荡，与最近的实验一致。
We present a theoretical study of coherent quantum dynamics of a single magnetic fluxon (MF) trapped in Josephson junction parallel arrays (JJPAs) with large kinetic inductances. The MF is the topological excitation carrying one quantum of magnetic flux, $Φ_0$. The MF is quantitatively described as the $2π$-kink in the distribution of Josephson phases, and for JJPAs with high kinetic inductances the characteristic length of such distribution ("the size" of MF) is drastically reduced. Characterizing such MFs by the Josephson phases of three consecutive Josephson junctions we analyse the various…
Structural and electrical transport properties of superconducting Au{0.7}In{0.3} films: A random array of superconductor-normal metal-superconductor (SNS) Josephson junctions
The structural and superconducting properties of Au{0.7}In{0.3} films, grown by interdiffusion of alternating Au and In layers, have been studied. The films were found to consist of a uniform solid solution of Au{0.9}In{0.1}, with excess In precipitated in the form of In-rich grains of various Au-In phases (with distinct atomic compositions), including intermetallic compounds. As the temperature was lowered, these individual grains became superconducting at a particular transition temperature (Tc), determined primarily by the atomic composition of the grain, before a fully superconducting stat…
Systematic modulation of superconducting gap dynamics in YBCO|BNT|YBCO Josephson Junctions through THz field interaction and BNT ferroelectric barrier
Chiang Mai University（清迈大学）；Universität Stuttgart（斯图加特大学）；University of Zambia（赞比亚大学）；Khon Kaen University（孔敬大学）；Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), Research Network of NANOTEC- KKU (RNN)（纳米材料研究与能源创新研究所（IN-RIE），NANOTEC-孔敬大学研究网络（RNN））；University of Macau（澳门大学）；Macau University of Science and Technology（澳门科技大学）
Vortex-parity-controlled diode effect in Corbino topological Josephson junctions
Harvard University（哈佛大学）；Sungkyunkwan University（成均馆大学）；Institute for Basic Science（基础科学研究院）；John A. Paulson School of Engineering and Applied Sciences（约翰·保尔逊工程与应用科学学院）；Columbia University（哥伦比亚大学）；Cornell University（康奈尔大学）；Weizmann Institute of Science（魏茨曼科学研究所）；Princeton University（普林斯顿大学）；National Institute for Materials Science（国立材料研究所）
