硅可调谐势垒单孔泵向高精度运行迈进

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Applied Physics Pub Date : 2024-01-05 DOI:10.1063/5.0179374
Gento Yamahata, Akira Fujiwara
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引用次数: 0

摘要

精确和可重现的电流产生是在计量学中实现量子电流标准的关键。可调谐势垒单电荷泵是一个很有前途的候选器件,它能精确地逐个传输单个电荷,误差率低于 ppm 级。虽然一些测量结果已经显示了这样的精度水平,但仍有必要进一步研究高精度操作的可能性,以便在许多设备中可重复地产生泵电流。在这里,我们研究了硅单孔泵,由于孔的有效质量大,它可能比单电子泵更有潜力。对单孔泵产生的电流的温度依赖性进行测量后发现,隧道势垒具有很高的能量选择性,这是高精度运行的关键参数。此外,我们还将动态栅极补偿技术应用于单孔泵,并证实该技术进一步提高了性能。最后,我们演示了单孔泵的千兆赫运行,其中泵误差率的估计下限约为 0.01 ppm。这些结果表明,硅单孔泵能够在计量和量子器件应用中实现高精度、高速和稳定的单电荷泵浦。
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Advances toward high-accuracy operation of tunable-barrier single-hole pumps in silicon
Precise and reproducible current generation is the key to realizing quantum current standards in metrology. A promising candidate is a tunable-barrier single-charge pump, which can accurately transfer single charges one by one with an error rate below the ppm level. Although several measurements have shown such levels of accuracy, it is necessary to further pursue the possibility of high-precision operation toward reproducible generation of the pumping current in many devices. Here, we investigated silicon single-hole pumps, which may have the potential to outperform single-electron pumps because of the heavy effective mass of holes. Measurements on the temperature dependence of the current generated by the single-hole pump revealed that the tunnel barrier had high energy selectivity, which is a critical parameter for high-accuracy operation. In addition, we applied the dynamic gate-compensation technique to the single-hole pump and confirmed that it yielded a further performance improvement. Finally, we demonstrated gigahertz operation of a single-hole pump in which the estimated lower bound of the pump error rate was around 0.01 ppm. These results imply that single-hole pumps in silicon are capable of high-accuracy, high-speed, and stable single-charge pumping in metrological and quantum-device applications.
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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