Zhi-Jun Song, Zhao-Zheng Lü, Quan Dong, Jun-Ya Feng, Zhong-Qing Ji, Yong Jin, Li Lü. Shot noise measurement for tunnel junctions using a homemade cryogenic amplifier at dilution refrigerator temperatures [J]. Acta Physica Sinica, 2019, 68(7): 070702-1
- Acta Physica Sinica
- Vol. 68, Issue 7, 070702-1 (2019)
Fig. 1. Circuit diagram (a) and picture (b) of a cryogenic low noise amplifier.低温低噪声放大器的电路图(a)和实物图(b)
Fig. 2. (a) Gain of the cryogenic amplifier with frequency; (b) equivalent input voltage noise of the cryogenic amplifier.(a)低温放大器增益-频率曲线; (b)低温放大器等效输入电压噪声
Fig. 3. Shot noise measurement system of Oxford dry dilution refrigerator Triton200(Center frequency of LC resonance circuit is 765 kHz).牛津干式稀释制冷机Triton200散粒噪声测量系统(LC谐振中心频率为765 kHz)
Fig. 4. Circuit AC noise model used for measurement system.测量系统交流噪声模型
Fig. 5. (a) Resistance of 10 kΩ TaN resistor as a function of temperature; (b) schematic diagram of thermal noise measurement of a network composed of TaN resistor and nickel chromium metal film.(a) 10 kΩ TaN电阻随温度变化; (b) TaN电阻与镍铬金属膜电阻构成的网络的热噪声测量的示意图
Fig. 6. Variation of PSD with temperature when r = 10, 20 kΩ.
r = 10, 20 kΩ时PSD随着温度的变化
Fig. 7. Differential resistance of an Al-AlOx -Al tunneling junction as a function of DC current I at 4 K(Inset: SEM image of a tunneling junction).
4 K温度下, Al-AlOx -Al隧道结的dV /dI 随着直流偏置I 的变化(内嵌图为隧道结SEM图)
Fig. 8. (a) Variation of PSD with frequency f and DC current I at 4 K; (b) variation of PSD at 765 kHz with DC current I at different temperatures.
(a) 4 K温度下, 输出的PSD随着频率f 以及直流电流I 的变化; (b)不同温度下, 中心频率765 kHz处输出的PSD随着直流电流I 的变化
Fig. 9. Shot noise Si of Al–AlOx –Al tunneling junction with DC current I at different temperatures and fitting curves.
不同温度下, Al–AlOx –Al隧道结的散粒噪声Si 随直流电流I 的变化及拟合曲线
Fig. 10. (a) Differential resistance dV /dI of Al–AlOx –Al junction vs. DC current I at 20 mK and V -I curve at 20 mK; (b) fano factor F of Al–AlOx –Al junction vs. DC current I at 20 mK.
(a) 20 mK下, Al–AlOx –Al的微分电阻dV /dI 随着直流偏置I 的变化以及V –I 曲线; (b) 20 mK下, Al–AlOx –Al的Fano因子F 随着直流偏置I 的变化
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Table 1. Comparison of power consumption and background noises of different cryogenic amplifiers made by different groups and companies.
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Table 2.
Comparison of our home-made cryogenic amplifiers.
不同架构的低温放大器参数对比
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Table 3.
Fano factors are obtained by fitting the test data at different temperature.
不同温度下, 拟合得到的Fano因子
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