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2018 Volume 27 Issue 6

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Wuhao Yang, Jian Wei. 2018: Cryogenic amplifier with low input-referred voltage noise calibrated by shot noise measurement, Chinese Physics B, 27(6): 205-210. doi: 10.1088/1674-1056/27/6/060702

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Wuhao Yang, Jian Wei. 2018: Cryogenic amplifier with low input-referred voltage noise calibrated by shot noise measurement, Chinese Physics B, 27(6): 205-210. doi: 10.1088/1674-1056/27/6/060702

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

International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China

Available Online: 01/01/2018
Fund Project: the National Natural Science Foundation of China(Grant 11474008)%the National Key Research and Development Program of China(Grant 2016YFA0300904)%the National Basic Research Program of China (Grant No.2011CBA00106).We thank Zhou Huibin, Niu Jiasen, Yang Fang and other students in our laboratory for help during the experiment, and thank professor Lin Xi for valuable discussion.We acknowledge support by Nanofab ICQM, Peking University and its m

Abstract

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 kΩ.The input-referred voltage noise of the amplifier at approximately 2 MHz is around 1 nV/√Hz.We demonstrate the performance of the amplifier by measuring shot noise on the AI/AIOx/AI tunneling junction with resistance about 17 kΩ at liquid helium temperature.
- cryogenic amplifier,
- shot noise,
- shadow evaporation,
- tunneling junction
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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