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Photoactive defect states in semiconducting single-walled carbon nanotubes (CNTs) have the potential to enable novel applications in quantum photonic technologies. While early experiments have established cryogenic CNTs as quantum light emitters [1], more recent work has identified luminescent defect states as sources of single photons up to room temperature [2,3]. For chemically-engineered CNTs, $\text{sp}^3$ functionalization offers means to deterministically influence the corresponding trap state properties via the characteristics of the covalent side chains. Recent findings show that the incorporation of $\text{sp}^3$ alkyl defects into the $\text{sp}^2$ lattice of narrow-diameter CNTs promotes the formation of both neutral and charged localized excitons [4] with unexpectedly high quantum efficiency. Here, we report the results of our cryogenic photoluminescence studies carried out on individual nanotubes functionalized with $\text{sp}^3$ side-wall chemistry.
[1] A. Högele, C. Galland, M. Winger, A. Imamoglu, Phys. Rev. Lett. 100, 217401 (2008).
[2] X. Ma, N. F. Hartmann, J. K. S. Baldwin, S. K. Doorn, H. Htoon, Nat. Nanotech. 10, 671–675 (2015).
[3] X. He et al., Nat. Photon. 11, 577–582 (2017).
[4] H. Kwon, M. Kim, M. Nutz, N. F. Hartmann, V. Perrin, B. Meany, M. S. Hofmann, C. W. Clark, S. K. Doorn, A. Höegele, Y. Wang, submitted.
