Quantum Interference and Critical Currents of Superconduct- ive Microcircuits Without Josephson Junctions

无约瑟夫森结的超导微电路的量子干涉和临界电流

• 批准号: 8505627
• 负责人: Herman Fink
• 金额: $ 11.54万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1985
• 资助国家: 美国
• 起止时间: 1985-09-01 至 1989-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8505627&HistoricalAwards=false
• 关键词: Quantum; Interference; Critical; Currents; Superconduct

Although most superconducting circuits employed for small-scale applications use Josephson conjunctions as an active or switching element, in some important instances Josephson junctions should be replaceable by simple thin wires whose dimensions are of the size of the temperature-dependent coherence length, E(T). The researchers are studying theoretically the feasibility of a microcircuit which may behave in many respects like a SQUID (superconducting quantum interference device) circuit without the use of Josephson junctions. This device may be fabricated by means of a superconducting loop whose diameter is of the order of magnitude of the coherence length and has connected to it on opposite sides superconducting wires for the purpose of injecting an external control current. Magnetic flux B is applied perpendicular to the ring. The flux density gives rise to a circulating current. The circulating current density will be studied as a function of magnetic flux for various injected control currents, and these results will be extended to more complicated circuits such as finite and infinite ladder circuits and arrays.

虽然大多数超导电路用于小规模 应用使用约瑟夫森合取作为有源或开关 在某些重要的情况下，约瑟夫森结应该是 可以用尺寸为 与温度相关的相干长度E（T）。 研究人员正在 从理论上研究微电路的可行性， 在许多方面表现得像SQUID（超导量子 干扰设备）电路，而不使用约瑟夫森结。 该装置可以借助于超导回路来制造，该超导回路 直径是相干长度的数量级， 在相对侧上连接到其上的超导导线， 注入外部控制电流。 施加磁通量B 垂直于环。 通量密度引起 循环电流 将研究循环电流密度 作为各种注入控制电流的磁通量的函数， 并且这些结果将被扩展到更复杂的电路， 有限和无限梯形电路和阵列。