Enhanced quantized current driven by surface acoustic waves

Ebbecke, J.; Bastian, G.; Blöcker, M.; Pierz, K.; Ahlers, F. J.

doi:10.1063/1.1319190

Cited by 31 publications

(33 citation statements)

References 16 publications

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“…Our device allows us to measure the acoustoelectric current in each wire separately and simultaneously as the wires have a common source of electrons but separate collector regions. This contrasts with an earlier device which had shared source and collector [10] for two paths which were separated at their point of closest approach by 5 microns, the acoustoelectric current flowing in the two paths being added together before measurement.…”

Section: Introductionmentioning

confidence: 72%

“…The fastest recombination time available in p-type GaAs is of order 100 ps, based on time resolved photoluminescence measurements of quantum wells using a streak camera [9], while τ i is set by the SAW wavelength. Successful measurements of acoustic single-electron transport have been performed at frequencies down to ∼ 1 GHz, or τ i = 1 ns [10]. Significantly longer wavelengths are impractical owing to the large impurity-free quasi-1D channel length required.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Transport of Electrons in Parallel Quantum Wires

et al. 2005

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Over the last few years we have developed a new method to control single-electrons by isolating and moving them through a submicron width channel formed in a GaAs/AlGaAs heterostructure using a surface acoustic wave. The acoustic wave acts to push electrons through the depleted submicron channel in packets each containing an integer number of electrons. Our primary motivation for studying this system has been to develop a new standard of dc current for metrological purposes, but our recent focus has widened to investigate the possibility of single-photon emission. Here we show new experimental results which demonstrate acoustoelectric current flow in adjacent 1D wires. These results have relevance both to the use of the system in a single-photon emission scheme, as well as in the creation of a proposed acoustoelectric quantum computer.

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Acoustic Transport of Electrons in Parallel Quantum Wires

et al. 2005

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“…This work is closely related to the single electron transport through one-dimensional channels by SAWs [12,13,14,15]. Here, the combination of the dynamic potential due to the SAW and the static potential of the one-dimensional channel is thought to define traveling QDs, and the quantization of the current is a result of the Coulomb repulsion between electrons transported in these QDs.…”

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confidence: 99%

Quantized charge pumping through a quantum dot by surface acoustic waves

Ebbecke

Fletcher

Janssen

et al. 2004

Applied Physics Letters

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We present a realization of quantized charge pumping. A lateral quantum dot is defined by metallic split gates in a GaAs/AlGaAs heterostructure. A surface acoustic wave whose wavelength is twice the dot length is used to pump single electrons through the dot at a frequency f = 3 GHz.The pumped current shows a regular pattern of quantization at values I = nef over a range of gate voltage and wave amplitude settings. The observed values of n, the number of electrons transported per wave cycle, are determined by the number of electronic states in the quantum dot brought into resonance with the fermi level of the electron reservoirs during the pumping cycle.

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“…The discovery of the so-called acoustoelectric effect was followed by the proposal of innovative device concepts. Among these Talyanskii et al proposed the implementation of a novel current standard, demonstrating very precise acoustoelectric current quantization due to charge drag by SAWs through a quantum point contact [8,9,10,11,12]. Control over the constriction width allows very precise selection of the number of electrons packed in each SAW minimum down to the single-electron-transport regime.…”

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confidence: 99%

Surface acoustic wave-induced electroluminescence intensity oscillation in planar light-emitting devices

Cecchini

Piazza

Beltram

et al. 2005

Applied Physics Letters

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Electroluminescence emission from surface acoustic wave-driven light-emitting diodes (SAWLEDs) is studied by means of time-resolved techniques. We show that the intensity of the SAW-induced electroluminescence is modulated at the SAW frequency (∼ 1 GHz), demonstrating electron injection into the p-type region synchronous with the SAW wavefronts.Surface-acoustic-wave (SAW) based devices are nowadays widely used for mobile and wireless applications, as well as for satellite communications and military applications [1]. The large-scale diffusion of sophisticated communication systems stimulated a fast rise in the SAW-based device market, reaching a production volume of several million devices per day [2]. More recently SAWs have attracted the interest of the semiconductor community in view of the exploitation of their interaction properties with two-dimensional-electron-gases (2DEGs) embedded in semiconductor heterostructures [3,4]. SAWs propagating through mesas containing highquality 2DEGs indeed drive modifications on the 2DEG equilibrium state. Acoustic waves propagating along piezo-electric substrates are accompanied by potential waves which can trap electrons in their minima and induce dc currents or voltages [5,6,7]. The discovery of the so-called acoustoelectric effect was followed by the proposal of innovative device concepts. Among these Talyanskii et al. proposed the implementation of a novel current standard, demonstrating very precise acoustoelectric current quantization due to charge drag by SAWs through a quantum point contact [8,9,10,11,12]. Control over the constriction width allows very precise selection of the number of electrons packed in each SAW minimum down to the single-electron-transport regime. One of the most appealing applications proposed after the first report of the acoustoelectric quantized current was to incorporate single-electron SAW pumps in planar 2D electron/2D hole gas (n-p) junctions to fabricate high-repetition-rate single-photon sources.

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Enhanced quantized current driven by surface acoustic waves

Cited by 31 publications

References 16 publications

Acoustic Transport of Electrons in Parallel Quantum Wires

Acoustic Transport of Electrons in Parallel Quantum Wires

Quantized charge pumping through a quantum dot by surface acoustic waves

Surface acoustic wave-induced electroluminescence intensity oscillation in planar light-emitting devices

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