Robustness of single-electron pumps at sub-ppm level

Stein, F.; Behr, R.; Götz, Martín; Pesel, Eckart; Weimann, Thomas; Pierz, K.; Schumacher, H. W.; Hohls, Frank

doi:10.1109/cpem.2016.7540622

Cited by 3 publications

(5 citation statements)

References 10 publications

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“…Further improved ULCA instruments [17,18] in the near future may enable exceeding this accuracy benchmark level. It is further expected that the [7]). For the measurements in panel (a) a type B uncertainty of 0.13 µA A −1 was attributed as stated in [6].…”

Section: Discussionmentioning

confidence: 99%

“…These measurements comprise variations of magnetic flux density, bias and gate voltages, and pump driving frequency, all of them being relevant operational parameters for GaAs-based SET pumps. Parts of the data shown here were already used in conference digest papers [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Measurements in each panel were taken during the same cooling cycle. Error bars correspond to combined standard uncertainties (k = 1) (raw data already used in[7]). For the measurements in panel (a) a type B uncertainty of 0.13 µA A −1 was attributed as stated in[6].…”

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confidence: 99%

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Robustness of single-electron pumps at sub-ppm current accuracy level

et al. 2016

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We report on characterizations of single-electron pumps at the highest accuracy level, enabled by improvements of the small-current measurement technique. With these improvements a new accuracy record in measurements on single-electron pumps is demonstrated: 0.16 µA • A −1 of relative combined uncertainty was reached within less than 1 d of measurement time. Additionally, robustness tests of pump operation on a sub-ppm level revealed a good stability of tunable-barrier single-electron pumps against variations in the operating parameters.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Robustness of single-electron pumps at sub-ppm current accuracy level

et al. 2016

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“…Most significantly for the application of pumps as practical current standards, we perform our measurements at ∼1.3 K, the temperature of pumped helium-4. This is in contrast to previous robustness studies [11,12,14] which were carried out at dilution refrigerator temperatures. Using a rigorous statistical approach to evaluate the plateau extension and flatness, we find robust plateaus in all the tuning parameters we investigated, flat to within the ∼ × − 2 10 6 relative statistical uncertainty of each data point.…”

Section: Introductionmentioning

confidence: 57%

“…While very promising for the metrological application of electron pumps, most of these studies were performed on carefully tuned devices. The required robustness of the current against changes in the pump control parameters has only recently begun to be investigated with high precision [11,12], and only in one type of etch-defined pump.…”

Section: Introductionmentioning

confidence: 99%

Robust operation of a GaAs tunable barrier electron pump

et al. 2017

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We demonstrate the robust operation of a gallium arsenide tunable-barrier single-electron pump operating with 1 part-per-million accuracy at a temperature of 1.3 K and a pumping frequency of 500 MHz. The accuracy of current quantisation is investigated as a function of multiple control parameters, and robust plateaus are seen as a function of three control gate voltages and RF drive power. The electron capture is found to be in the decay-cascade, rather than the thermally-broadened regime. The observation of robust plateaus at an elevated temperature which does not require expensive refrigeration is an important step towards validating tunable-barrier pumps as practical current standards.PACS numbers: 1234 1 arXiv:1810.00100v1 [cond-mat.mes-hall]

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