Cryogenic amplifier with low input-referred voltage noise calibrated by shot noise measurement

被引：3
|
作者：
Yang, Wuhao [1 ]
Wei, Jian [1 ]
机构：
[1] Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
来源：
CHINESE PHYSICS B | 2018年 / 27卷 / 06期
基金：
中国国家自然科学基金;
关键词：
cryogenic amplifier; shot noise; shadow evaporation; tunneling junction; TOPOLOGICAL DIRAC SEMIMETAL; SUPPRESSION; SYSTEM;
D O I：
10.1088/1674-1056/27/6/060702
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A low-noise cryogenic amplifier for the bandwidth from 100 kHz to 2 MHz with commercially available components is presented. The amplifier is mounted on the cold finger of our home-made liquid helium dipstick. The input impedance of the amplifier is 2 k Omega. The input-referred voltage noise of the amplifier at approximately 2 MHz is around 1 nV/root Hz . We demonstrate the performance of the amplifier by measuring shot noise on the Al/AlOx/Al tunneling junction with resistance about 17 k Omega at liquid helium temperature.
引用
收藏
页数：6
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