期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 92, 期 12, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0076196
关键词
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资金
- Japan Society for the Promotion of Science KAKENHI [JP19H05603, JP21H01022, JP19H00652]
- JST PRESTO [JP17940407]
The article introduces a cryogenic transimpedance amplifier (TA) suitable for cross-correlation current-noise measurements, utilizing homemade high-electron-mobility transistors to achieve high resolution measurements, and demonstrating its advantages in measuring shot noise at quantum point contacts in a quantum Hall system.
We report a cryogenic transimpedance amplifier (TA) suitable for cross-correlation current-noise measurements. The TA comprises homemade high-electron-mobility transistors with high transconductance and low noise characteristics, fabricated in an AlGaAs/GaAs heterostructure. The low input-referred noise and wide frequency band of the TA lead to a high resolution in current-noise measurements. The TA's low input impedance suppresses unwanted crosstalk between two distinct currents from a sample, justifying the advantage of the TA for cross-correlation measurements. We demonstrate the high resolution of a TA-based experimental setup by measuring the shot noise generated at a quantum point contact in a quantum Hall system.
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