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

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [3];  [3];  [3];  [2]
  1. Rice Univ., Houston, TX (United States); DOE/OSTI
  2. Rice Univ., Houston, TX (United States)
  3. Tokyo Metropolitan Univ. (Japan)
+ Show Author Affiliations

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.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); U.S. National Science Foundation; JSPS KAKENHI; JST CREST
Grant/Contract Number:
FG02-06ER46308
OSTI ID:
1609737
Alternate ID(s):
OSTI ID: 1491056
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 3 Vol. 99; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Science and applications of wafer-scale crystalline carbon nanotube films prepared through controlled vacuum filtration text January 2018
One-directional thermal transport in densely aligned single-wall carbon nanotube films journal November 2019
Macroscopically aligned carbon nanotubes for flexible and high-temperature electronics, optoelectronics, and thermoelectrics journal December 2019
One-directional thermal transport in densely aligned single-wall carbon nanotube films text January 2019

Figures / Tables (15)

FIG. 1(p. 3)figure FIG. 1
FIG. 2(p. 3)figure FIG. 2
FIG. 3(p. 4)figure FIG. 3
FIG. 4(p. 5)figure FIG. 4
FIG. 5(p. 6)figure FIG. 5
FIG. 6(p. 6)figure FIG. 6
FIG. 7(p. 7)figure FIG. 7
FIG. 8(p. 7)figure FIG. 8
FIG. 10(p. 9)figure FIG. 10
FIG. 11(p. 9)figure FIG. 11
FIG. 9(p. 9)figure FIG. 9
FIG. 12(p. 11)figure FIG. 12
FIG. 13(p. 11)figure FIG. 13
TABLE I(p. 11)table TABLE I
FIG. 14(p. 12)figure FIG. 14

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Related Subjects

36 MATERIALS SCIENCE
carbon-based materials
excitons
materials science
nanotubes
optical absorption spectroscopy
optical conductivity
optical microcavities
physics
thin films