Untersuchung von Semifluxonen in langen Josephson 0-pi-Kontakten

长约瑟夫森 0-pi 接触中的半流子研究

• 批准号: 5414975
• 负责人: Dr. Edward Goldobin
• 金额: --
• 依托单位: Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5414975?language=en
• 关键词: Untersuchung; von; Semifluxonen; langen; Josephson

Due to the recent progress in fabrication technology, several types of p-junctions, e.g. based on anisotropic cuprate superconductors with d-wave order parameter symmetry or on superconductor-ferromagnet structures, are available now for experimental investigations. In a long Josephson junction containing 0 and p parts comparable by length with the Josephson penetration depth lJ, at the point where 0 and p facets join, fractional vortices are spontaneously created at certain conditions. Such fractional vortices usually carry only one half of a magnetic flux quantum and therefore are called semifluxons. Within this project we focus on the experimental investigation of the behaviour of fractional vortices in 0-p-LJJs. Semifluxons are very different from fluxons in a way they form a ground state, how they move, how they interact with each other and with fluxons. Semifluxons can result in half-integer quantization of observable parameters and have many other interesting features. This investigation is intended to improve the understanding of fractional quantization in superconductors, to study the behavior of fractional flux quanta and to suggest and try new ideas for Josephson electronics in the classical or the quantum regime.

由于制造技术的最新进展，几种类型的p结，例如基于具有d波序参数对称性的各向异性铜氧化物超导体或超导体-铁磁体结构，现在可用于实验研究。在包含0和p部分的长约瑟夫森结中，在0和p小面接合的点处，在某些条件下自发地产生分数涡旋，所述长约瑟夫森结的长度与约瑟夫森穿透深度lJ相当。这种分数涡旋通常只携带一半的磁通量量子，因此被称为半磁通子。在这个项目中，我们专注于实验研究的分数涡在0-p-LJJ的行为。半磁通子与磁通子的不同之处在于它们形成基态的方式，它们如何运动，它们如何相互作用以及与磁通子相互作用。半流子可以导致可观测参数的半整数量化，并具有许多其他有趣的特性。本研究旨在提高对超导体分数量子化的理解，研究分数通量量子的行为，并提出和尝试经典或量子体系中约瑟夫森电子学的新思想。