Enhanced current quantization in high-frequency electron pumps in a perpendicular magnetic field

Wright, Samuel J.; Blumenthal, M.; Gumbs, Godfrey; Thorn, Andrea; Pepper, M.; Janssen, T. J. B. M.; Holmes, S. N.; Anderson, David V.; Jones, G. A. C.; Nicoll, C. A.; Ritchie, D. A.

doi:10.1103/physrevb.78.233311

Cited by 49 publications

(38 citation statements)

References 14 publications

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“…This option allows us to improve the flatness of the current plateaus by increasing the subband energy spacings. We found that the flatness of the first current plateau of ef at 100 MHz depends on the subband energy spacings and the result was comparable to that of the previous work without an external magnetic field [6]. Figure 1(a) shows the schematic diagram of the pump device.…”

Section: Introductionsupporting

confidence: 86%

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Gate-defined quantum dot single electron pump

Seo

Ahn

et al. 2012

2012 Conference on Precision Electromagnetic Measurements

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We report single electron pumping through a metal gate defined quantum dot (QD) fabricated on a GaAs/AlGaAs 2-dimensional electron gas (2DEG) system. The quantum dot used for pumping is uniquely designed to have larger subband energy spacings than those of a conventional quantum dot. Several quantized current steps were observed at liquid helium temperature when the pump was operated at 100 MHz of pumping frequency. The flatness of the current plateaus was measured with different subband energy spacings. It was found that the flatness of the plateau is influenced by the subband energy spacings of the QD.

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Section: Introductionsupporting

confidence: 86%

“…Also parallelization of the pumps [5] is relatively easy with this technique. It has been found that high magnetic field helps to improve the accuracy of the pump current [6]. Despite of all the advantages that single-parameter pumping has, the subband energy spacings of the QD cannot be controlled separately with this method.…”

Section: Introductionmentioning

confidence: 98%

Gate-defined quantum dot single electron pump

Seo

Ahn

et al. 2012

2012 Conference on Precision Electromagnetic Measurements

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“…They showed that single-parameter pumping is robust in the sense that wide current plateaus appear in the parameter space but their measurement uncertainty was limited to about 10 À2 , and hence a detailed study of the behavior of the accuracy as a function of these parameters was not available. Wright et al (2008) made an important empirical observation that the accuracy of the single-parameter pump can be improved by an application of perpendicular-to-plane magnetic field [see also Wright et al (2009) and Fig. 25(b)].…”

Section: Experiments On Gallium Arsenide Quantum Dotsmentioning

confidence: 99%

Single-electron current sources: Toward a refined definition of the ampere

et al. 2013

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The control of electrons at the level of the elementary charge e was demonstrated experimentally already in the 1980s. Ever since, the production of an electrical current ef, or its integer multiple, at a drive frequency f has been a focus of research for metrological purposes. This review discusses the generic physical phenomena and technical constraints that influence single-electron charge transport and presents a broad variety of proposed realizations. Some of them have already proven experimentally to nearly fulfill the demanding needs, in terms of transfer errors and transfer rate, of quantum metrology of electrical quantities, whereas some others are currently ''just'' wild ideas, still often potentially competitive if technical constraints can be lifted. The important issues of readout of singleelectron events and potential error correction schemes based on them are also discussed. Finally, an account is given of the status of single-electron current sources in the bigger framework of electric quantum standards and of the future international SI system of units, and applications and uses of single-electron devices outside the metrological context are briefly discussed.

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“…The desired standard would generate the current I ¼ Nef by transferring N electrons per cycle at frequency f. Although notable achievements based on experiments with charge turnstile, 1-4 surface acoustic wave (SAW), [5][6][7][8][9] and single electron pumps [10][11][12][13][14] have reached, no fully satisfactory results in terms of both the accuracy and current magnitude have been realized yet. The exact mechanism of the current quantization is not fully understood, therefore, it is difficult to precisely design or simulate the devices.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of the electron transport through a mesoscopic island by surface acoustic wave

Chen

Yang

Song

et al. 2013

Journal of Applied Physics

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Articles you may be interested inThe electronic properties of a core/shell/well/shell spherical quantum dot with and without a hydrogenic impurityWe have studied the surface acoustic waves (SAWs) transport electrons through a multiple constrictions where a mesoscopic island is placed between the adjacent ones. The electrochemical potential of the island can be modulated by changing the adjacent gate voltages. Then, with the help of the accumulated charge in the island, some peculiar quantized events are observed in the experiments. And a physical model is proposed to explain this quantization, which could help us to understand the mechanism of the acousto-electric current further. In addition, if the SAW dots drive electrons through a static impurity dot which placed at the transport channel, then due to the regulating action by the static impurity dot, the current display fractional plateaus. V C 2013 American Institute of Physics. [http://dx.

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Enhanced current quantization in high-frequency electron pumps in a perpendicular magnetic field

Cited by 49 publications

References 14 publications

Gate-defined quantum dot single electron pump

Gate-defined quantum dot single electron pump

Single-electron current sources: Toward a refined definition of the ampere

Manipulation of the electron transport through a mesoscopic island by surface acoustic wave

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