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Reaction, diffusion and dissociation of excitons on carbon nanotubes

Reaction, diffusion and dissociation of excitons on carbon nanotubes
Reaction, diffusion and dissociation of excitons on carbon nanotubes
Photoexcitation of carbon nanotubes generates excitons which decay by exciton-exciton annihilation at sufficient density. We examine this decay under conditions of one, few and many excitons per nanotube. A classic 1D reaction-diffusion behaviour is observed, with decay limited by diffusion for t>3ps and by reaction for t<3ps. At high densities the exciton population saturates, and by analysis of the rate equations we show that this is consistent with dissociation of excitons when their spacing is 1.3nm, close to the exciton length.
Allam, J.
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Sutton, R.
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Sajjad, M.T.
38158b7b-7976-4b08-a6cd-5bedeba2dfff
Litvinenko, K.
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Wang, Z.
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Siddique, S.
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Yang, Q-H
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Brown, T.
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Loh, W.H.
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Allam, J.
53cb4beb-2055-4aea-b477-a47b126e6d1e
Sutton, R.
0cb48b6b-30f8-42a9-849d-4c5a3c8dcc0c
Sajjad, M.T.
38158b7b-7976-4b08-a6cd-5bedeba2dfff
Litvinenko, K.
17fc718f-395a-4bc8-930a-8f8556eea836
Wang, Z.
57c6741f-8764-46fd-bdb7-41fa6608c8a7
Siddique, S.
28862fde-c308-4d07-b541-fb6667220382
Yang, Q-H
3748ab34-609e-41f1-b27e-98aa8d08d15c
Brown, T.
a64aae36-bb30-42df-88a2-11be394e8c89
Loh, W.H.
2b7c57fe-000d-4405-a529-810597317ea8

Allam, J., Sutton, R., Sajjad, M.T., Litvinenko, K., Wang, Z., Siddique, S., Yang, Q-H, Brown, T. and Loh, W.H. (2010) Reaction, diffusion and dissociation of excitons on carbon nanotubes. CLEO/QELS 2010, United States. 16 - 21 May 2010. (doi:10.1364/QELS.2010.QThC5).

Record type: Conference or Workshop Item (Paper)

Abstract

Photoexcitation of carbon nanotubes generates excitons which decay by exciton-exciton annihilation at sufficient density. We examine this decay under conditions of one, few and many excitons per nanotube. A classic 1D reaction-diffusion behaviour is observed, with decay limited by diffusion for t>3ps and by reaction for t<3ps. At high densities the exciton population saturates, and by analysis of the rate equations we show that this is consistent with dissociation of excitons when their spacing is 1.3nm, close to the exciton length.

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Published date: 16 May 2010
Venue - Dates: CLEO/QELS 2010, United States, 2010-05-16 - 2010-05-21

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Local EPrints ID: 442963
URI: http://eprints.soton.ac.uk/id/eprint/442963
PURE UUID: 3490adff-edc6-472d-aa55-a7b0610cb7bd

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Date deposited: 05 Aug 2020 16:30
Last modified: 05 Aug 2020 16:30

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