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Title: Direct observation of cross-polarized excitons in aligned single-chirality single-wall carbon nanotubes

Abstract

Optical properties of single-wall carbon nanotubes (SWCNTs) for light polarized parallel to the nanotube axis have been studied extensively, whereas their response to light polarized perpendicular to the nanotube axis has not been well explored. Here, by using a macroscopic film of highly aligned single-chirality (6,5) SWCNTs, we performed a systematic polarization-dependent optical absorption spectroscopy study. In addition to the commonly observed angular-momentum-conserving interband absorption of parallel-polarized light, which generates E 11 and E 22 excitons, we observed a small but unambiguous absorption peak whose intensity is maximum for perpendicular-polarized light. We attribute this feature to the lowest-energy cross-polarized interband absorption processes that change the angular momentum along the nanotube axis by ±1, generating E 12 and E 21 excitons. Unlike previous observations of cross-polarized excitons in polarization-dependent photoluminescence and circular dichroism spectroscopy experiments, our direct observation using absorption spectroscopy allowed us to quantitatively analyze this resonance. Specifically, we determined the energy and oscillator strength of this resonance to be 1.54 and 0.05, respectively, compared with the values for the E 11 exciton peak. Furthermore, these values, in combination with a comparison with theoretical calculations, in turn led to an assessment of the environmental effect on the strength of Coulombmore » interactions in this aligned single-chirality SWCNT film.« less

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [1]
  1. Rice Univ., Houston, TX (United States)
  2. Tokyo Metropolitan Univ. (Japan)
Publication Date:
Research Org.:
Rice Univ., Houston, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); JSPS KAKENHI; JST CREST
OSTI Identifier:
1609737
Alternate Identifier(s):
OSTI ID: 1491056
Grant/Contract Number:  
FG02-06ER46308; ECCS-1708315; JP16H00919; JP17K14088; JP25107003; JP17H01069; JP17H06124; JP15K21722; JPMJCR17I5
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 3; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; materials science; physics; excitons; optical conductivity; carbon-based materials; nanotubes; optical microcavities; thin films; optical absorption spectroscopy

Citation Formats

Katsutani, Fumiya, Gao, Weilu, Li, Xinwei, Ichinose, Yota, Yomogida, Yohei, Yanagi, Kazuhiro, and Kono, Junichiro. Direct observation of cross-polarized excitons in aligned single-chirality single-wall carbon nanotubes. United States: N. p., 2019. Web. doi:10.1103/physrevb.99.035426.
Katsutani, Fumiya, Gao, Weilu, Li, Xinwei, Ichinose, Yota, Yomogida, Yohei, Yanagi, Kazuhiro, & Kono, Junichiro. Direct observation of cross-polarized excitons in aligned single-chirality single-wall carbon nanotubes. United States. doi:10.1103/physrevb.99.035426.
Katsutani, Fumiya, Gao, Weilu, Li, Xinwei, Ichinose, Yota, Yomogida, Yohei, Yanagi, Kazuhiro, and Kono, Junichiro. Wed . "Direct observation of cross-polarized excitons in aligned single-chirality single-wall carbon nanotubes". United States. doi:10.1103/physrevb.99.035426. https://www.osti.gov/servlets/purl/1609737.
@article{osti_1609737,
title = {Direct observation of cross-polarized excitons in aligned single-chirality single-wall carbon nanotubes},
author = {Katsutani, Fumiya and Gao, Weilu and Li, Xinwei and Ichinose, Yota and Yomogida, Yohei and Yanagi, Kazuhiro and Kono, Junichiro},
abstractNote = {Optical properties of single-wall carbon nanotubes (SWCNTs) for light polarized parallel to the nanotube axis have been studied extensively, whereas their response to light polarized perpendicular to the nanotube axis has not been well explored. Here, by using a macroscopic film of highly aligned single-chirality (6,5) SWCNTs, we performed a systematic polarization-dependent optical absorption spectroscopy study. In addition to the commonly observed angular-momentum-conserving interband absorption of parallel-polarized light, which generates E11 and E22 excitons, we observed a small but unambiguous absorption peak whose intensity is maximum for perpendicular-polarized light. We attribute this feature to the lowest-energy cross-polarized interband absorption processes that change the angular momentum along the nanotube axis by ±1, generating E12 and E21 excitons. Unlike previous observations of cross-polarized excitons in polarization-dependent photoluminescence and circular dichroism spectroscopy experiments, our direct observation using absorption spectroscopy allowed us to quantitatively analyze this resonance. Specifically, we determined the energy and oscillator strength of this resonance to be 1.54 and 0.05, respectively, compared with the values for the E11 exciton peak. Furthermore, these values, in combination with a comparison with theoretical calculations, in turn led to an assessment of the environmental effect on the strength of Coulomb interactions in this aligned single-chirality SWCNT film.},
doi = {10.1103/physrevb.99.035426},
journal = {Physical Review B},
issn = {2469-9950},
number = 3,
volume = 99,
place = {United States},
year = {2019},
month = {1}
}

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