Parametric Characterization and Macroscopic Quantum Tunneling of Nb/AlOx/Nb Josephson Junctions

被引：4

作者：

Li, Hao ^{[1
]}

Li, Gang ^{[1
]}

Liu, Jianshe ^{[1
]}

Li, Tiefu ^{[1
]}

Chen, Wei ^{[1
]}

机构：

[1] Tsinghua Univ, Inst Microelect, Dept Micro Nanoelect, Tsinghua Natl Lab Informat Sci & Technol, Beijing 100084, Peoples R China

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2014年 / 24卷 / 05期

基金：

美国国家科学基金会;

关键词：

Critical current; fiske self-resonant step; Josephson tunneling junction; macroscopic quantum tunneling; ZERO-VOLTAGE STATE; ELECTRONICS; CAPACITANCE; ACTIVATION; CIRCUITS;

D O I：

10.1109/TASC.2014.2349900

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Parameters of Nb/AlOx/Nb Josephson including its critical current and capacitance which determine the dynamic energy consumption and speed of the superconducting electronics have been measured. The critical current of a 22 x 22 mu m(2) junction is 1801 +/- 52 mu A calculated from the dependent curve between the lifetime of zero-voltage and switching current. The specific capacitance is 0.051 +/- 0.008 pF/mu m(2) obtained by observing Fiske self-resonant step when applied several Gauss magnetic field. Critical current distributions had been measured as a function of temperature from 900 mK to 40 mK. The distribution widths become independent of temperature below 200 mK, which indicates the transition between thermal activation and macroscopic quantum tunneling of junction phase.

引用

页数：5

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