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arXiv 2102.13320cond-mat.mes-hall
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无掺杂GaAs/AlGaAs二维电子气中的非绝热单电子泵

Non-adiabatic single-electron pump in a dopant-free GaAs/AlGaAs 2DEG

B. Buonacorsi, F. Sfigakis, A. Shetty, M. C. Tam, H. S. Kim, S. R. Harrigan, F. Hohls, M. E. Reimer, Z. R. Wasilewski, J. Baugh

摘要:

在无掺杂的GaAs二维电子气(2DEG)中,利用非绝热单电子泵实现了量子化电荷泵。无掺杂剂的III-V族平台允许双极器件,例如p-i-n结,其可以与这样的泵组合以形成电驱动的单光子源。我们的泵浦工作频率高达0.95 GHz,并在宽松的实验条件下实现了卓越的性能:零磁场和温度高达5 K的单栅极泵浦,由简单的RF正弦波形驱动。拟合到一个通用的衰减级联模型产生的品质因数值$δ$,比较有利的报告调制掺杂GaAs泵在类似的条件下工作。这里报道的器件已经适用于光电子应用,并且通过进一步改进可以提供一种不需要亚开尔文温度和高磁场的电流标准。

英文摘要:

We have realized quantized charge pumping using non-adiabatic single-electron pumps in dopant-free GaAs two-dimensional electron gases (2DEGs). The dopant-free III-V platform allows for ambipolar devices, such as p-i-n junctions, that could be combined with such pumps to form electrically-driven single photon sources. Our pumps operate at up to 0.95 GHz and achieve remarkable performance considering the relaxed experimental conditions: one-gate pumping in zero magnetic field and temperatures up to 5K, driven by a simple RF sine waveform. Fitting to a universal decay cascade model yields values for the figure of merit $δ$ that compare favorably to reported modulation-doped GaAs pumps operating under similar conditions. The devices reported here are already suitable for optoelectronics applications, and with further improvement could offer a route to a current standard that does not require sub-Kelvin temperatures and high magnetic fields.

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