Ubiquity of Exciton Localization in Cryogenic Carbon Nanotubes.
We present photoluminescence studies of individual semiconducting single-wall carbon nanotubes at room and cryogenic temperatures. From the analysis of spatial and spectral features of nanotube photoluminescence, we identify characteristic signatures of unintentional exciton localization. Moreover, we quantify the energy scale of exciton localization potentials as ranging from a few to a few tens of millielectronvolts and stemming from both environmental disorder and shallow covalent side-wall defects. Our results establish disorder-induced crossover from the diffusive to the localized regime of nanotube excitons at cryogenic temperatures as a ubiquitous phenomenon in micelle-encapsulated and as-grown carbon nanotubes.
Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München , Geschwister-Scholl-Platz 1, D-80539 München, Germany.
Matthias S
MS
Hofmann
Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München , Geschwister-Scholl-Platz 1, D-80539 München, Germany.
Jonathan
J
Noé
Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München , Geschwister-Scholl-Platz 1, D-80539 München, Germany.
Alexander
A
Kneer
Physical Chemistry and Applied Spectroscopy Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.
Jared J
JJ
Crochet
Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München , Geschwister-Scholl-Platz 1, D-80539 München, Germany.
Alexander
A
Högele
Carbon nanotube; exciton localization; photoluminescence spectroscopy