Diffusive and Ballistic Vortices in Superconducting Josephson Arrays

9402020奥兰多技术摘要：将从实验和数值两方面研究一维和二维约瑟夫森结阵列中涡旋的扩散和弹道运动。通过使用Nb阵列，我们将探索一种新的物理区域，其中穿透深度小于阵列的单胞。这些研究将被用来模拟涡旋运动，研究涡旋的相干运动，以及研究非线性动力系统的新的锁相解。对于亚微米级的结，阵列可以表现出涡旋的弹道运动，并引起介观输运。非技术摘要：约瑟夫森结构成了超导电子学中大多数器件的基础。我们将研究这种耦合在一起的器件的晶格。在这样的晶格中，磁场被束缚在被称为涡旋的量化磁通束中。这些阵列使人们能够研究新区域中的涡旋运动，在这些区域中，运动可以是弹道的，并可以产生新的集体态，这些集体态是相干的，甚至是量子力学的。通过了解这种运动，人们将能够设计出更高效、更新颖的超导电子器件。人们还可以增加对发生在宏观(而不是原子)长度上的量子力学效应的理解，以及对动力系统中新的非线性效应的理解。***

9402020 Orlando Technical abstract: The diffusive and ballistic motion of vortices in one and two dimensional arrays of Josephson junctions will be studied both experimentally and numerically. By using niobium arrays we will explore a new physical regime where the penetration depth is smaller than the unit cell of the array. These investigations will be used to model vortex motion, to study coherent motion of vortices, and to study novel phase-locked solutions of non-linear dynamical systems. With sub-micron size junctions, the arrays can exhibit ballistic motion of the vortices and give rise to mesoscopic transport which. Non-technical abstract: Josephson junctions form the basis of most devices in superconducting electronics. We will study a lattice of such devices coupled together. In such a lattice the magnetic field is bound in bundles of quantized magnetic flux called vortices. These arrays allow one to study vortex motion in new regimes where motion can be ballistic and can give rise to novel collective states that are coherent or even quantum mechanical. By understanding such motion one will be able to design more efficient and novel superconducting electronic devices. One can also add to the understanding of quantum mechanical effects which occur on macroscopic (rather than atomic) lengths and to the understanding of new non-linear effects in dynamical systems. ***