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Exciton-phonon Bound Complex in Single-walled Carbon Nanotubes Revealed by High-field Magneto-optical Spectroscopy

机译:单壁碳纳米管中的激子 - 声子束缚复合物揭示   通过高场磁光谱学

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摘要

High-field magneto-optical spectroscopy was conducted on highly-selectedchiral (6,5) specific single-walled carbon nanotubes. Spectra of phononsidebands in both 1st and 2nd sub-bands were observed to be unchanged by theapplication of an external magnetic field up to 52 T. Our analyses led to theconclusion that both phonon sidebands in respective sub-band originate from thedark K-momentum singlet (D-K-S) excitons. Moreover, while the relative orderingbetween the bandedge bright exciton and its zero-momentum anti-bondingcounterpart was found to be opposite for the 1st and 2nd sub-bands, therelative ordering between the D-K-S exciton and the band-edge bright excitonwas clarified to be the same for both sub-bands. Energy of these D-K-S excitonswas estimated to be ~ 21.5 and ~ 37.3 meV above the band-edge bright excitonfor the 1st and 2nd sub-bands, respectively.
机译:高场磁光光谱学是在高度选择的手性(6,5)特定单壁碳纳米管上进行的。通过施加高达52 T的外部磁场,可以观察到第一和第二子带中的声子边带频谱没有变化。我们的分析得出结论,相应子带中的两个声子边带都源自暗K动量单峰( DKS)激子。此外,虽然发现在第一和第二子带中,带边缘明亮激子与其零动量反结合对位之间的相对顺序相反,但澄清了DKS激子与带边缘明亮激子之间的相对顺序是相同的。对于两个子带。这些D-K-S激子的能量估计分别比第一个和第二个子带的带边明亮激子高约21.5和37.3 meV。

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