Terahertz Excitonic Response of Isolated Single-Walled Carbon Nanotubes
We have investigated the ultrafast far-infrared transmission of isolated single-walled carbon nanotubes using optical-pump THz-probe spectroscopy. The THz dielectric response is dominated by excitons with an initial, rapid decay due to Auger recombination followed by a slow decay of isolated single...
| Hauptverfasser: | , , , , |
|---|---|
| Format: | Journal article |
| Sprache: | English |
| Veröffentlicht: |
2009
|
| _version_ | 1826270227966459904 |
|---|---|
| author | Xu, X Chuang, K Nicholas, R Johnston, M Herz, L |
| author_facet | Xu, X Chuang, K Nicholas, R Johnston, M Herz, L |
| author_sort | Xu, X |
| collection | OXFORD |
| description | We have investigated the ultrafast far-infrared transmission of isolated single-walled carbon nanotubes using optical-pump THz-probe spectroscopy. The THz dielectric response is dominated by excitons with an initial, rapid decay due to Auger recombination followed by a slow decay of isolated single excitons. Frequencydependent analysis of the photomduced dielectric function suggest an internal excitonic excitation at ∼11 meV with further low-frequency (∼0.6 and 1.4 THz) absorption features at high densities ascribed to exciton complexes. A featureless conductivity bleaching is attributed to an exciton-induced reduction in the mobility of free carriers caused by phase-space filling. © 2009 American Chemical Society. |
| first_indexed | 2024-03-06T21:37:34Z |
| format | Journal article |
| id | oxford-uuid:46cac025-e6b2-48c5-9c3d-2512bd2cfd3e |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:37:34Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:46cac025-e6b2-48c5-9c3d-2512bd2cfd3e2022-03-26T15:15:59ZTerahertz Excitonic Response of Isolated Single-Walled Carbon NanotubesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:46cac025-e6b2-48c5-9c3d-2512bd2cfd3eEnglishSymplectic Elements at Oxford2009Xu, XChuang, KNicholas, RJohnston, MHerz, LWe have investigated the ultrafast far-infrared transmission of isolated single-walled carbon nanotubes using optical-pump THz-probe spectroscopy. The THz dielectric response is dominated by excitons with an initial, rapid decay due to Auger recombination followed by a slow decay of isolated single excitons. Frequencydependent analysis of the photomduced dielectric function suggest an internal excitonic excitation at ∼11 meV with further low-frequency (∼0.6 and 1.4 THz) absorption features at high densities ascribed to exciton complexes. A featureless conductivity bleaching is attributed to an exciton-induced reduction in the mobility of free carriers caused by phase-space filling. © 2009 American Chemical Society. |
| spellingShingle | Xu, X Chuang, K Nicholas, R Johnston, M Herz, L Terahertz Excitonic Response of Isolated Single-Walled Carbon Nanotubes |
| title | Terahertz Excitonic Response of Isolated Single-Walled Carbon Nanotubes |
| title_full | Terahertz Excitonic Response of Isolated Single-Walled Carbon Nanotubes |
| title_fullStr | Terahertz Excitonic Response of Isolated Single-Walled Carbon Nanotubes |
| title_full_unstemmed | Terahertz Excitonic Response of Isolated Single-Walled Carbon Nanotubes |
| title_short | Terahertz Excitonic Response of Isolated Single-Walled Carbon Nanotubes |
| title_sort | terahertz excitonic response of isolated single walled carbon nanotubes |
| work_keys_str_mv | AT xux terahertzexcitonicresponseofisolatedsinglewalledcarbonnanotubes AT chuangk terahertzexcitonicresponseofisolatedsinglewalledcarbonnanotubes AT nicholasr terahertzexcitonicresponseofisolatedsinglewalledcarbonnanotubes AT johnstonm terahertzexcitonicresponseofisolatedsinglewalledcarbonnanotubes AT herzl terahertzexcitonicresponseofisolatedsinglewalledcarbonnanotubes |