研究目的
Investigating the synchronized electron pumping phenomena in parallelized single-electron pumps and estimating the pumping error to see if it increases after parallelization.
研究成果
The research demonstrated that parallelization of single-electron pumps can increase the output level without significantly increasing the pumping error, provided a proper choice of rf gates is made in accordance with the direction of the applied magnetic field. The study also highlighted the importance of considering the chirality of the edge state to avoid rf-induced heating effects.
研究不足
The study acknowledges that the model estimate of pumping error for the parallelized pump may have given possibly poorer or better values than the real ones due to the sensitivity of the model fitting to the slope of the transitions between plateaus. Additionally, the measurement resolution was lower than ~10^-3 for I ~ 10 pA level, which could affect the accuracy estimates.
1：Experimental Design and Method Selection:
The study involved fabricating a pair of single-electron pumps in parallel on a chip level to investigate their synchronized electron pumping phenomena. The pumping error was estimated to assess the impact of parallelization.
2：Sample Selection and Data Sources:
The device was fabricated on a GaAs/AlGaAs 2-dimensional electron gas system (2DEG) with specific mobility and electron density at 4.2 K.
3：2 K.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup included quantum point contact (QPC) gates, a trench gate, and rf modulation signals applied via bias tees at room temperature.
4：Experimental Procedures and Operational Workflow:
Measurements were performed at ~0.3 K or at 4.2 K under magnetic fields. An rf modulation signal was added to the DC signal applied to the entrance gate to transfer quantized electrons from the source to the drain.
5：3 K or at 2 K under magnetic fields. An rf modulation signal was added to the DC signal applied to the entrance gate to transfer quantized electrons from the source to the drain.
Data Analysis Methods:
5. Data Analysis Methods: The pumping error was estimated using the decay-cascade model to analyze the quantized current profiles and assess the accuracy of the 1st current plateau.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
