Radiative recombination during ambipolar carrier transport by surface acoustic waves in GaAs quantum wells

Zhang, S. K.; Santos, P. V.; Hey, R.

doi:10.1063/1.1463706

Cited by 7 publications

(9 citation statements)

References 10 publications

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“…The inhomogeneity is probably due to a distribution of defects in the QW, such as those reported in Ref. 7. In addition, the transport distances in the ͑311͒ QW's are much shorter than those reported in Ref.…”

Section: Figcontrasting

confidence: 44%

“…A particular feature of this coupled system of QW's and QWR's is that the transport depends on whether the SAW propagates parallel or perpendicular to the QWR. In the former case, we demonstrate that carrier diffusion parallel to the wavefront, which characterizes the SAW-induced transport in QW's, 7 is inhibited by the QWR confinement potential. As a result, the QWR acts as a channel for the ambipolar transport of carriers over distances several orders of magnitudes larger than the QWR width.…”

Section: Introductionmentioning

confidence: 97%

“…PL measurements were carried out at 12 K using a microscope with adjustable illumination and detection areas, each with a diameter of about 2 m. The adjustable separation between the illumination and detection spots allows us to investigate the ambipolar carrier transport within a length scale of a few m's. 7,8 Excitation below the Al 0.3 Ga 0.7 As barriers was provided by the continuous radiation from a Ti:sapphire laser ( L ϭ750 nm) or by a pulsed semiconductor laser ( L ϭ687 nm) with a pulse width of 75 ps. The time-averaged PL was detected using a cooled charge-coupled-device detector.…”

Section: Methodsmentioning

confidence: 99%

“…7,8 In these measurements, the generation spot G was placed in the SAW propagation path some micrometers away from a semitransparent metal stripe deposited on the sample surface, as illustrated in Fig. 3͑a͒.…”

Section: Spatial Profilesmentioning

confidence: 99%

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Surface-acoustic-wave-induced carrier transport in quantum wires

et al. 2002

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Alsina, F.; Santos, P.V.; Schönherr, H.-P.; Seidel, W.; Ploog, K.; Nötzel, R. Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. The ambipolar transport of photogenerated electron-hole pairs by surface acoustic waves ͑SAW's͒ in coupled GaAs quantum wells ͑QW's͒ and quantum wires ͑QWR's͒ is investigated by spatially and timeresolved photoluminescence. Experimental configurations for SAW propagation direction parallel or perpendicular to the QWR's have been studied. In the first configuration, the QWR confinement potential inhibits lateral carrier diffusion. The carriers are then efficiently transported along the wire as well-defined charge packages with a repetition rate corresponding to the SAW frequency. In the second configuration, we demonstrate that the SAW can be used to transfer electron-hole pairs generated in the QW into the QWR. We also provide clear evidence for the extraction of carriers from the QWR into the QW, when the SAW piezoelectric field is sufficiently strong to overcome the QWR confinement potential.

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Section: Figcontrasting

confidence: 44%

Section: Introductionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Spatial Profilesmentioning

confidence: 99%

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Surface-acoustic-wave-induced carrier transport in quantum wires

et al. 2002

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“…Previous investigations of the SAW-induced ambipolar transport in quantum wells ͑QW's͒ have shown an enhanced diffusion parallel to the wave front, which is inherent to the increase of the recombination lifetime due to the spatial separation of e-h pairs by the piezoelectric field. 4 The QWR confinement potential inhibits the lateral diffusion so that the carriers are then efficiently transported along the QWR axis as compact charge packages. 5 Due to their small widths, onedimensional transport channels based on QWR's are preferred over those defined by etching techniques or by metal gates in applications where a dynamic and periodic spatial distribution or transfer of charge is required.…”

Section: Real-time Dynamics Of the Acoustically Induced Carrier Transmentioning

confidence: 99%