Journal
NANO LETTERS
Volume 13, Issue 3, Pages 1016-1022Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl304182j
Keywords
Nanowire; quantum confinement; excitation spectroscopy; modeling
Categories
Funding
- National Science Foundation [DMA-1105362, 1105121, ECCS-1100489]
- Solid-State Lighting Science Center, an Energy Frontier Research Center (EFRC)
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (BES)
- BES Division of Materials Science and Engineering
- Laboratory Directed Research and Development program at Sandia National Laboratories
- United States Department of Energy [DE-AC04-94-AL85000]
- Australian Research Council (ARC)
- ARC [LE0454166]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1100489] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1105362] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1105121] Funding Source: National Science Foundation
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The electronic properties of thin, nanometer scale GaAs quantum well tubes embedded inside the AlGaAs shell of a GaAs core-multishell nanowire are investigated using optical spectroscopies. Using numerical simulations to model cylindrically and hexagonally symmetric systems, we correlate these electronic properties with structural characterization by aberration-corrected scanning transmission electron microscopy of nanowire cross sections. These tubular quantum wells exhibit extremely high quantum efficiency and intense emission for extremely low submicrowatt excitation powers in both photoluminescence and photoluminescence excitation measurements. Numerical calculations of the confined eigenstates suggest that the electrons and holes in their ground states are confined to extremely localized one-dimensional filaments at the corners of the hexagonal structure which extend along the length of the nanowire.
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