Free exciton emission and dephasing in individual ZnO nanowires

Yang Zhang; Dai Jang Chen; Ching Ting Lee

doi:10.1063/1.2793178

Free exciton emission and dephasing in individual ZnO nanowires

Yang Zhang
, Dai Jang Chen
, Ching Ting Lee

Department of Photonics

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

We report on systematic measurements of the dephasing of the free excitonic transition in individual ZnO nanowires with a diameter of about 70 nm. The temperature-dependent intensity of the free exciton (FX) emission is well reproduced by a thermally activated behavior having two constant activation energies of 5.98 and 30.63 meV. The FX linewidth broadening with temperature reveals the dephasing of FX scattered by acoustic phonons rather than longitudinal optical phonons. These findings indicate that the dephasing mechanism scattering from acoustic phonons in individual ZnO nanowires result from the compensation of acoustic phonons to the nonconservation of crystal momentum.

Original language	English
Article number	161911
Journal	Applied Physics Letters
Volume	91
Issue number	16
DOIs	https://doi.org/10.1063/1.2793178
Publication status	Published - 2007

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2793178

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abstract = "We report on systematic measurements of the dephasing of the free excitonic transition in individual ZnO nanowires with a diameter of about 70 nm. The temperature-dependent intensity of the free exciton (FX) emission is well reproduced by a thermally activated behavior having two constant activation energies of 5.98 and 30.63 meV. The FX linewidth broadening with temperature reveals the dephasing of FX scattered by acoustic phonons rather than longitudinal optical phonons. These findings indicate that the dephasing mechanism scattering from acoustic phonons in individual ZnO nanowires result from the compensation of acoustic phonons to the nonconservation of crystal momentum.",

author = "Yang Zhang and Chen, \{Dai Jang\} and Lee, \{Ching Ting\}",

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AU - Zhang, Yang

AU - Chen, Dai Jang

AU - Lee, Ching Ting

N1 - Funding Information: This work was supported by the National Science Council, Taiwan, Republic of China.

PY - 2007

Y1 - 2007

N2 - We report on systematic measurements of the dephasing of the free excitonic transition in individual ZnO nanowires with a diameter of about 70 nm. The temperature-dependent intensity of the free exciton (FX) emission is well reproduced by a thermally activated behavior having two constant activation energies of 5.98 and 30.63 meV. The FX linewidth broadening with temperature reveals the dephasing of FX scattered by acoustic phonons rather than longitudinal optical phonons. These findings indicate that the dephasing mechanism scattering from acoustic phonons in individual ZnO nanowires result from the compensation of acoustic phonons to the nonconservation of crystal momentum.

AB - We report on systematic measurements of the dephasing of the free excitonic transition in individual ZnO nanowires with a diameter of about 70 nm. The temperature-dependent intensity of the free exciton (FX) emission is well reproduced by a thermally activated behavior having two constant activation energies of 5.98 and 30.63 meV. The FX linewidth broadening with temperature reveals the dephasing of FX scattered by acoustic phonons rather than longitudinal optical phonons. These findings indicate that the dephasing mechanism scattering from acoustic phonons in individual ZnO nanowires result from the compensation of acoustic phonons to the nonconservation of crystal momentum.

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VL - 91

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 16

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ER -

Free exciton emission and dephasing in individual ZnO nanowires

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