Electron temperature dependence of the electron-phonon coupling strength in double-wall carbon nanotubes

• Published in: Applied physics letters Vol. 103; no. 4
• Main Author: Chatzakis, Ioannis
• Format: Journal Article
• Language: English
• Published: 22.07.2013
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4816055

We applied Time-Resolved Two-Photon Photoemission spectroscopy to probe the electron-phonon (e-ph) coupling strength in double-wall carbon nanotubes. The e-ph energy transfer rate G(Te, Tl) from the electronic system to the lattice depends linearly on the electron (Te) and lattice (Tl) temperatures for Te>ΘDebye. Moreover, we numerically solved the Two-Temperature Model. We found: (i) a Te decay with a 3.5 ps time constant and no significant change in Tl; (ii) an e-ph coupling factor of 2 × 1016 W/m3; (iii) a mass-enhancement parameter, λ, of (5.4 ± 0.9) × 10−4; and (iv) a decay time of the electron energy density to the lattice of 1.34 ± 0.85 ps.