Breakdown of Corner States and Carrier Localization by Monolayer Fluctuations in Radial Nanowire Quantum Wells
| Autor: | Anna Sitek, Gerhard Abstreiter, Hubert J. Krenner, Daniel Ruhstorfer, Markus Döblinger, D. Rudolph, Lisa Janker, Maximilian M. Sonner, Jonathan J. Finley, Gregor Koblmüller, Andrei Manolescu, Achim Wixforth |
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| Rok vydání: | 2019 |
| Předmět: |
3D optical data storage
Materials science Mechanical Engineering Surface acoustic wave Nanowire Bioengineering Heterojunction 02 engineering and technology General Chemistry Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics Molecular physics Monolayer ddc:530 General Materials Science Charge carrier 0210 nano-technology Quantum well |
| Zdroj: | Nano Letters. 19:3336-3343 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.9b01028 |
| Popis: | We report a comprehensive study of the impact of the structural properties in radial GaAs-Al0.3Ga0.7As nanowire-quantum well heterostructures on the optical recombination dynamics and electrical transport properties, emphasizing particularly the role of the commonly observed variations of the quantum well thickness at different facets. Typical thickness fluctuations of the radial quantum well observed by transmission electron microscopy lead to pronounced localization. Our optical data exhibit clear spectral shifts and a multipeak structure of the emission for such asymmetric ring structures resulting from spatially separated, yet interconnected quantum well systems. Charge carrier dynamics induced by a surface acoustic wave are resolved and prove efficient carrier exchange on native, subnanosecond time scales within the heterostructure. Experimental findings are corroborated by theoretical modeling, which unambiguously show that electrons and holes localize on facets where the quantum well is the thickes... |
| Databáze: | OpenAIRE |
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