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Chin. Phys. B, 2018, Vol. 27(6): 060702    DOI: 10.1088/1674-1056/27/6/060702
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Cryogenic amplifier with low input-referred voltage noise calibrated by shot noise measurement

Wuhao Yang(杨伍昊), Jian Wei(危健)
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
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 Al/AlOx/Al tunneling junction with resistance about 17 kΩ at liquid helium temperature.

Keywords:  cryogenic amplifier      shot noise      shadow evaporation      tunneling junction  
Received:  02 February 2018      Revised:  11 March 2018      Accepted manuscript online: 
PACS:  07.20.Mc (Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment)  
  67.30.hr (Films)  
  73.23.-b (Electronic transport in mesoscopic systems)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant No.11474008),the National Key Research and Development Program of China (Grant No.2016YFA0300904),and the National Basic Research Program of China (Grant No.2011CBA00106).

Corresponding Authors:  Wuhao Yang     E-mail:  yangwuhao@pku.edu.cn

Cite this article: 

Wuhao Yang(杨伍昊), Jian Wei(危健) Cryogenic amplifier with low input-referred voltage noise calibrated by shot noise measurement 2018 Chin. Phys. B 27 060702

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