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Broken Symmetry Optical Transitions in (6,5) Single-Walled Carbon Nanotubes Containing sp3 Defects Revealed by First-Principles Theory

Journal Article · · Nano Letters
 [1];  [2];  [3];  [4]
  1. Boston University, MA (United States); Boston University
  2. Argonne National Laboratory (ANL), Argonne, IL (United States); University of Chicago, IL (United States)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States); University of Chicago, IL (United States); Northwestern Argonne Institute of Science and Engineering, Evanston, IL (United States)
  4. Boston University, MA (United States)
We present a first-principles many-body perturbation theory study of nitrophenyl-doped (6,5) single-walled nanotubes (SWCNTs) to understand how sp3 doping impacts the excitonic properties. sp3-doped SWCNTs are promising as a class of optoelectronic materials with bright tunable photoluminescence, long spin coherence, and single-photon emission (SPE), motivating the study of spin excitations. We predict that the dopant results in a single unpaired spin localized around the defect site, which induces multiple low-energy excitonic peaks. By comparing optical absorption and photoluminescence from experiment and theory, we identify the transitions responsible for the red-shifted, defect-induced E11* peak, which has demonstrated SPE for some dopants; the presence of this state is due to both the symmetry-breaking associated with the defect and the presence of the defect-induced in-gap state. Furthermore, we find an asymmetry between the contribution of the two spin channels, suggesting that this system has potential for spin-selective optical transitions.
Research Organization:
Boston University, MA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; SC0023402
OSTI ID:
2339548
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 2 Vol. 24; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (4)