Matches in SemOpenAlex for { <https://semopenalex.org/work/W2316405523> ?p ?o ?g. }
- W2316405523 abstract "In metallic systems, strong screening of the Coulomb interaction between an electron and a hole by free electrons largely prevents the formation of an exciton. In one-dimensional metallic systems, however, the screening effect is significantly reduced. Recent theoretical and experimental studies suggest that an exciton state can be realized in metallic single-walled carbon nanotubes (SWNTs) due to their ideal one-dimensional structure. Here, we experimentally investigate photoluminescence in both metallic-SWNT-enriched and semiconducting-SWNT-enriched samples using femtosecond time-resolved photoluminescence measurements. By comparing luminescence kinetics and time-integrated spectra between the two samples, the observed signal in the metallic-SWNT-enriched sample is attributed to the luminescence from metallic SWNTs. We also show complementary data of photoabsorption signals in the metallic-SWNT-enriched sample measured by transient absorption spectroscopy. A difference in temporal behavior between the luminescence and absorption signals strongly suggests that the luminescence is excitonic in nature, and the exciton lifetime is found to be $40ifmmodepmelsetextpmfi{}10$ fs. This long lifetime indicates that a large exciton binding energy leads to a relatively stable exciton state in the presence of metallic electrons." @default.
- W2316405523 created "2016-06-24" @default.
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- W2316405523 date "2012-01-18" @default.
- W2316405523 modified "2023-10-16" @default.
- W2316405523 title "Ultrafast luminescence kinetics of metallic single-walled carbon nanotubes: Possible evidence for excitonic luminescence" @default.
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- W2316405523 doi "https://doi.org/10.1103/physrevb.85.045428" @default.
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