Gordeev, Georgy ; Flavel, Benjamin ; Krupke, Ralph ; Kusch, Patryk ; Reich, Stephanie (2019)
Asymmetry of resonance Raman profiles in semiconducting single-walled carbon nanotubes at the first excitonic transition.
In: Physical Review B, 99 (4)
doi: 10.1103/PhysRevB.99.045404
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Carbon nanotubes are one-dimensional nanoscale systems with strongly pronounced chirality dependent opti-cal properties with multiple excitonic transitions. We investigated the high-energy G mode of semiconductingsingle walled nanotubes of different chiralities at first excitonic transition by applying resonant Raman spec-troscopy. The G mode intensity dependence on excitation energy yielded asymmetric resonance Ramanprofiles similar to ones we reported for the second excitonic transition. We found the scattering efficiency tobe strongest at the incoming Raman resonance. Still, the degree of asymmetry is different for the first andsecond transitions and the first transition profiles provide a narrower line shape due to longer exciton life-times. The overall scattering efficiency is up to a factor of 25 times more intense at first excitonic transition,compared to the second transition. The fifth-order perturbation theory, with implemented phonon scatteringpathways between excitonic states, excellently reproduced experimental data.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Gordeev, Georgy ; Flavel, Benjamin ; Krupke, Ralph ; Kusch, Patryk ; Reich, Stephanie |
| Art des Eintrags: | Bibliographie |
| Titel: | Asymmetry of resonance Raman profiles in semiconducting single-walled carbon nanotubes at the first excitonic transition |
| Sprache: | Englisch |
| Publikationsjahr: | 3 Januar 2019 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 99 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.1103/PhysRevB.99.045404 |
| URL / URN: | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.04... |
| Kurzbeschreibung (Abstract): | Carbon nanotubes are one-dimensional nanoscale systems with strongly pronounced chirality dependent opti-cal properties with multiple excitonic transitions. We investigated the high-energy G mode of semiconductingsingle walled nanotubes of different chiralities at first excitonic transition by applying resonant Raman spec-troscopy. The G mode intensity dependence on excitation energy yielded asymmetric resonance Ramanprofiles similar to ones we reported for the second excitonic transition. We found the scattering efficiency tobe strongest at the incoming Raman resonance. Still, the degree of asymmetry is different for the first andsecond transitions and the first transition profiles provide a narrower line shape due to longer exciton life-times. The overall scattering efficiency is up to a factor of 25 times more intense at first excitonic transition,compared to the second transition. The fifth-order perturbation theory, with implemented phonon scatteringpathways between excitonic states, excellently reproduced experimental data. |
| Freie Schlagworte: | Carbon nanotubes, resonant Raman, first excitonic transition, exciton-phonon coupling |
| Zusätzliche Informationen: | SFB 658, subproject A6 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Molekulare Nanostrukturen |
| Hinterlegungsdatum: | 20 Nov 2020 11:56 |
| Letzte Änderung: | 20 Nov 2020 11:56 |
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