Real-time dynamics of the acoustically induced carrier transport in GaAs quantum wires

Alsina, F.; Santos, P. V.; Schönherr, H.-P.; Nötzel, R.; Ploog, K.

doi:10.1103/physrevb.67.161305

Cited by 18 publications

(11 citation statements)

References 11 publications

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“…Thus, the PL emission is only weakly suppressed at this local phase of the SAW corresponding to the maxima in the TCSPC signal. We note that similar observations have been reported for planar, fully embedded semiconductor heterostructures 7,15 confirming our interpretation. This SAW-driven modulation requires that the PL decay time is significantly faster than T SAW /2.…”

supporting

confidence: 93%

Directional and Dynamic Modulation of the Optical Emission of an Individual GaAs Nanowire Using Surface Acoustic Waves

et al. 2011

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We report on optical experiments performed on individual GaAs nanowires and the manipulation of their temporal emission characteristics using a surface acoustic wave. We find a pronounced, characteristic suppression of the emission intensity for the surface acoustic wave propagation aligned with the axis of the nanowire. Furthermore, we demonstrate that this quenching is dynamical as it shows a pronounced modulation as the local phase of the surface acoustic wave is tuned. These effects are strongly reduced for a SAW applied in the direction perpendicular to the axis of the nanowire due to their inherent one-dimensional geometry. We

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confidence: 93%

Directional and Dynamic Modulation of the Optical Emission of an Individual GaAs Nanowire Using Surface Acoustic Waves

et al. 2011

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“…In the last decade, the IV-IV and III-V nanostructures such as quantum dots, 1-5 wires, 6,7 and wells 8,9 have attracted much research interest. Among them the self-assembled Ge/ Si quantum dots ͑QDs͒ have been a special subject of debate.…”

Section: Introductionmentioning

confidence: 99%

Short-range order structures of self-assembled Ge quantum dots probed by multiple-scattering extended x-ray absorption fine structure

et al. 2005

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Multiple-scattering extended x-ray absorption fine structure ͑MS-EXAFS͒ has been used to investigate the local structures around Ge atoms in self-assembled Ge-Si quantum dots ͑QDs͒ grown on Si͑001͒ substrate. The MS effect of Ge QDs is dominated by the scattering path Ge 0 → B 1 → B 2 → Ge 0 ͑DS2͒, which contributes a signal destructively interfering with that of the second shell single-scattering path ͑SS2͒. MS-EXAFS analysis reveals that the degree of Ge-Si intermixing for Ge-Si QDs strongly depends on the temperature at which the silicon cap layer is overgrown. It is found that the interatomic distances ͑R Ge-Ge and R Ge-Si ͒ within the third nearest-neighbor shells in Ge-Si QDs indicate the compressively strained nature of QDs. The present study demonstrates that the MS-EXAFS provides detailed information on the QDs strain and the Ge-Si mixing beyond the nearest neighbors.

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“…These dots can trap photo-generated electrons and holes in the minima and maxima, respectively, of the piezoelectric energy and transport them with the acoustic velocity [1,2]. The combination of ambipolar acoustic transport with the one-dimensional (1-D) confinement provided by the QWR may also have implications for the transport of spins.…”

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confidence: 98%

Acoustic charge and spin transport in GaAs quantum wires

Alsina

Stotz

Hey

et al. 2008

Phys. Status Solidi (c)

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Optical investigation of the transport of electrons and holes in GaAs quantum wires by surface acoustic waves shows that carriers can be efficiently transported over several tens of mm. Despite the efficient charge transport, the transport distances for photoexcited spins were found to be very short. These short spin transport lengths indicate that spin dephasing is not limited by spin motion (the DP mechanism) but rather by spin relaxation during momentum scattering. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Real-time dynamics of the acoustically induced carrier transport in GaAs quantum wires

Abstract: Real-time dynamics of the acoustically induced carrier transport in GaAs quantum wiresAlsina, F.; Santos, P.V.; Schönherr, H.-P.; Nötzel, R.; Ploog, K.

Cited by 18 publications

References 11 publications

Directional and Dynamic Modulation of the Optical Emission of an Individual GaAs Nanowire Using Surface Acoustic Waves

Directional and Dynamic Modulation of the Optical Emission of an Individual GaAs Nanowire Using Surface Acoustic Waves

Short-range order structures of self-assembled Ge quantum dots probed by multiple-scattering extended x-ray absorption fine structure

Acoustic charge and spin transport in GaAs quantum wires

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