Quantized charge pumping through a quantum dot by surface acoustic waves

Ebbecke, J.; Fletcher, Nick; Janssen, T. J. B. M.; Ahlers, F. J.; Pepper, M.; Beere, Harvey E.; Ritchie, D. A.

doi:10.1063/1.1757016

Cited by 54 publications

(53 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To overcome the limitation pointed out by Ebbecke et al (2003), the charging energy was increased in the system by defining a quantum dot with surface gates rather than utilizing an open one-dimensional channel (Ebbecke et al, 2004). Thus the applied SAWs modulate both the tunnel barriers between the dot and the reservoirs and the electrochemical potential at the dot.…”

Section: Surface-acoustic-wave-based Charge Pumpingmentioning

confidence: 99%

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

et al. 2013

View full text Add to dashboard Cite

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.

show abstract

Section: Surface-acoustic-wave-based Charge Pumpingmentioning

confidence: 99%

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

et al. 2013

View full text Add to dashboard Cite

show abstract

“…In all above realizations the fixed link between the QD size and the modulation frequency as well as the limitation to harmonic modulation have been seen as a challenge for device optimization [70], or for improving the relatively low yield [88,89]. Experiments dealing with the latter issue have combined gate defined QDs with SAW modulation [89].…”

Section: Modulation By Surface Acoustic Wavesmentioning

confidence: 99%

“…Experiments dealing with the latter issue have combined gate defined QDs with SAW modulation [89]. Another challenge represents the requirement for a large driving power: in order to obtain flat current plateaus large microwave powers in excess of 10 dBm have to be applied to the SAW transducer.…”

Section: Modulation By Surface Acoustic Wavesmentioning

confidence: 99%

Non-adiabatic quantized charge pumping with tunable-barrier quantum dots: a review of current progress

2015

View full text Add to dashboard Cite

Precise manipulation of individual charge carriers in nanoelectronic circuits underpins practical applications of their most basic quantum property -the universality and invariance of the elementary charge. A charge pump generates a net current from periodic external modulation of parameters controlling a nanostructure connected to source and drain leads; in the regime of quantized pumping the current varies in steps of qef as function of control parameters, where qe is the electron charge and f is the frequency of modulation. In recent years, robust and accurate quantized charge pumps have been developed based on semiconductor quantum dots with tunable tunnel barriers. These devices allow modulation of charge exchange rates between the dot and the leads over many orders of magnitude and enable trapping of a precise number of electrons far away from equilibrium with the leads. The corresponding non-adiabatic pumping protocols focus on understanding of separate parts of the pumping cycle associated with charge loading, capture and release. In this report we review realizations, models and metrology applications of quantized charge pumps based on tunable-barrier quantum dots.

show abstract

“…Moreover, surface acoustic waves with amplitudes less than 0.01 mV have proved to provide an efficient means of implementing quantized charge pumping. 13 The acoustic vibrations could be described as phonons which have been shown in experiment 14 and theory 15 to couple strongly to electrons. When the energy-level separations in a quantum dot are equal to the energies of the excited phonons, the phonons could be absorbed by electrons in the dot.…”

Section: Resultsmentioning

confidence: 97%

Pulse-induced acoustoelectric vibrations in surface-gated GaAs-based quantum devices

et al. 2007

View full text Add to dashboard Cite

We present the results of a numerical investigation which show the excitation of acoustoelectric modes of vibration in GaAs-based heterostructures due to sharp nanosecond electric-field pulses applied across surface gates. In particular, we show that the pulses applied in quantum information processing applications are capable of exciting acoustoelectric modes of vibration including surface acoustic modes which propagate for distances greater than conventional device dimensions. We show that the pulse-induced acoustoelectric vibrations are capable of inducing significant undesired perturbations to the evolution of quantum systems.

show abstract

Quantized charge pumping through a quantum dot by surface acoustic waves

Cited by 54 publications

References 18 publications

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

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

Non-adiabatic quantized charge pumping with tunable-barrier quantum dots: a review of current progress

Pulse-induced acoustoelectric vibrations in surface-gated GaAs-based quantum devices

Contact Info

Product

Resources

About