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Coherence lifetime broadening of an optical transition in a 2 atom diameter HgTe nanowire: a temperature dependent resonance Raman study

Coherence lifetime broadening of an optical transition in a 2 atom diameter HgTe nanowire: a temperature dependent resonance Raman study
Coherence lifetime broadening of an optical transition in a 2 atom diameter HgTe nanowire: a temperature dependent resonance Raman study
This paper presents the results of measurements of the temperature dependence of resonance Raman scattering from 2 atom diameter HgTe nanowires embedded in the central pore of single walled carbon nanotubes, over the temperature range 4–295 K and excitation photon energies in the range 1.65 to 1.90 eV. The spectra are analysed to extract the temperature dependence of the phonon energies and linewidths and the central energy, linewidth and peak scattering strength of the optical resonances. The temperature dependence of the peak scattering strength is explained by a model in which the resonance broadening is dominated by coherence lifetime broadening, allowing us to determine the coherence lifetime of the underlying optical transition: 9 fs at 295 K and 18 fs at 50 K. The results are comparable with similar results on carbon nanotubes which suggests that the optical transitions responsible for the Raman resonances are excitonic
2046-2069
95387-95395
Spencer, Joseph
4ae3c181-002e-491d-a9c3-8936062a49c8
Smith, David
d9b2c02d-b7ea-498b-9ea1-208a1681536f
McDonnell, Liam
f55afd9a-aa83-4a34-b3ac-c1b9ff3858b9
Sloan, J.
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Kashtiban, R.J.
efae4b1f-dca2-4345-a6b2-ba054e69b3d3
Spencer, Joseph
4ae3c181-002e-491d-a9c3-8936062a49c8
Smith, David
d9b2c02d-b7ea-498b-9ea1-208a1681536f
McDonnell, Liam
f55afd9a-aa83-4a34-b3ac-c1b9ff3858b9
Sloan, J.
79bdd478-9258-45fd-a3af-9048fa17d8c1
Kashtiban, R.J.
efae4b1f-dca2-4345-a6b2-ba054e69b3d3

Spencer, Joseph, Smith, David, McDonnell, Liam, Sloan, J. and Kashtiban, R.J. (2016) Coherence lifetime broadening of an optical transition in a 2 atom diameter HgTe nanowire: a temperature dependent resonance Raman study. RSC Advances, 6 (98), 95387-95395. (doi:10.1039/C6RA22065G).

Record type: Article

Abstract

This paper presents the results of measurements of the temperature dependence of resonance Raman scattering from 2 atom diameter HgTe nanowires embedded in the central pore of single walled carbon nanotubes, over the temperature range 4–295 K and excitation photon energies in the range 1.65 to 1.90 eV. The spectra are analysed to extract the temperature dependence of the phonon energies and linewidths and the central energy, linewidth and peak scattering strength of the optical resonances. The temperature dependence of the peak scattering strength is explained by a model in which the resonance broadening is dominated by coherence lifetime broadening, allowing us to determine the coherence lifetime of the underlying optical transition: 9 fs at 295 K and 18 fs at 50 K. The results are comparable with similar results on carbon nanotubes which suggests that the optical transitions responsible for the Raman resonances are excitonic

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Accepted/In Press date: 21 September 2016
e-pub ahead of print date: 28 September 2016
Published date: 2016
Organisations: Quantum, Light & Matter Group

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Local EPrints ID: 401409
URI: http://eprints.soton.ac.uk/id/eprint/401409
ISSN: 2046-2069
PURE UUID: b9afa4ba-bef5-4709-a248-b4a268618bae

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Date deposited: 17 Oct 2016 10:32
Last modified: 21 Nov 2021 05:42

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Contributors

Author: Joseph Spencer
Author: David Smith
Author: Liam McDonnell
Author: J. Sloan
Author: R.J. Kashtiban

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