0000000000354366

AUTHOR

Carsten Pfüller

showing 3 related works from this author

Polarized recombination of acoustically transported carriers in GaAs nanowires

2012

: The oscillating piezoelectric field of a surface acoustic wave (SAW) is employed to transport photoexcited electrons and holes in GaAs nanowires deposited on a SAW delay line on a LiNbO3 crystal. The carriers generated in the nanowire by a focused light spot are acoustically transferred to a second location where they recombine. We show that the recombination of the transported carriers occurs in a zinc blende section on top of the predominant wurtzite nanowire. This allows contactless control of the linear polarized emission by SAWs which is governed by the crystal structure. Additional polarization-resolved photoluminescence measurements were performed to investigate spin conservation d…

Materials sciencePhotoluminescenceSurface acoustic wavesNanowireNanochemistryNanotechnologyElectronEnginyeria acústicaCharge transportMaterials Science(all)Spin transportPolarizationGeneral Materials SciencePhotoluminescenceWurtzite crystal structureNano Expressbusiness.industryNanowiresSurface acoustic waveGaAsCiència dels materialsPolarization (waves)Condensed Matter PhysicsPiezoelectricityOptoelectronicsbusinessNanoscale Research Letters
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Carrier Transport in GaAs Nanowires Using Surface Acoustic Waves

2012

ABSTRACTThe oscillating piezoelectric field of a surface acoustic wave (SAW) is employed to transport photoexcited electrons and holes in GaAs nanowires (NWs) transferred to a SAW beam line on a LiNbO3 crystal. We show that carriers generated in the NW by a focused light spot can be acoustically transported to a second location, where they recombine emitting short light pulses. The results presented here demonstrate the high-frequency manipulation of carriers in NWs without the use of electrical contacts, which opens new perspectives for applications in opto-electronic devices operating at GHz frequencies.

CrystalMaterials scienceField (physics)business.industrySurface acoustic waveNanowireOptoelectronicsAcoustic waveElectronbusinessPiezoelectricityElectrical contactsMRS Proceedings
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Acoustically driven photon antibunching in nanowires.

2011

The oscillating piezoelectric field of a surface acoustic wave (SAW) is employed to transport photoexcited carriers, as well as to spatially control exciton recombination in GaAs-based nanowires (NWs) on a subns time scale. The experiments are carried out in core-shell NWs transferred to a SAW delay line on a LiNbO(3) crystal. Carriers generated in the NW by a focused laser spot are acoustically transferred to a second location, leading to the remote emission of subns light pulses synchronized with the SAW phase. The dynamics of the carrier transport, investigated using spatially and time-resolved photoluminescence, is well-reproduced by computer simulations. The high-frequency contactless …

PhotoluminescencePhotonMaterials scienceMacromolecular SubstancesSurface PropertiesExcitonPhase (waves)NanowireMolecular ConformationBioengineeringGalliumArsenicalslaw.inventionCondensed Matter::Materials ScienceSonicationOpticslawMaterials TestingGeneral Materials ScienceParticle SizePhotonsPhoton antibunchingbusiness.industryMechanical EngineeringSurface acoustic waveGeneral ChemistryCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsLaserNanostructuresOptoelectronicsbusinessCrystallizationNano letters
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