English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
 Local TagsRelease HistoryDetailsSummary
  Ultrafast changes in the far-infrared conductivity of carbon nanotubes

Frischkorn, C., Kampfrath, T., von Volkmann, K., Perfetti, L., & Wolf, M. (2008). Ultrafast changes in the far-infrared conductivity of carbon nanotubes. In IEEE Digest: 33rd Int. Conf. on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) (pp. 185-185). New York, NY 10017, USA: IEEE.

Item is

 

show all hide all

Basic

show hide
Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0010-FBA3-F Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0010-FBA4-D
Genre: Conference Paper

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Frischkorn, Christian1, Author           
Kampfrath, Tobias1, Author           
von Volkmann, Konrad1, Author           
Perfetti, Luca, Author
Wolf, Martin1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

Content

show
hide
Free keywords: -
 Abstract: The ultrafast charge-carrier dynamics in single-wall carbon nanotubes (NTs) have been investigated by time-resolved THz spectroscopy. Both the equilibrium and non-equilibrium conductivity data of the NTs in the far-infrared (FIR) spectral range from 1 to 40 THz are dominated by optical transitions across the band gap of tubes with gap energies of ~ 10 meV. A simple model based on an ensemble of two-level systems excellently explains all experimental findings. In particular, the surprisingly weak temperature dependence of the FIR conductivity has been shown to arise from tube-to-tube variation of the chemical potential which is ~ 100 meV in our sample. The results strongly suggest to use the temperature dependence of the FIR conductivity as a very sensitive and contact-free probe of the NT sample purity. Finally, the relaxation of the photo-excited NT sheet on a picosecond time scale mainly reflects the cooling of hot phonons which is about five times faster than in graphite. This points to much stronger lattice anharmonicities in NTs.

Details

show
hide
Language(s): eng - English
 Dates: 2008-11-05
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 436340
URI: http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4665509
DOI: 10.1109/ICIMW.2008.4665509
 Degree: -

Event

show
hide
Title: 33rd Int. Conf. on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
Place of Event: Pasadena, CA
Start-/End Date: 2008-09-15 - 2008-09-19

Legal Case

show

Project information

show

Source 1

show
hide
Title: IEEE Digest: 33rd Int. Conf. on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
Source Genre: Proceedings
 Creator(s):
Affiliations:
Publ. Info: New York, NY 10017, USA : IEEE
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 185 - 185 Identifier: ISBN: 978-1-4244-2119-0