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

Ioannis Chatzakis

doi:10.1063/1.4816055

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

Ioannis Chatzakis

Physics

Research output: Contribution to journal › Article

4 Scopus citations

Abstract

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(T_e, T_l) from the electronic system to the lattice depends linearly on the electron (T_e) and lattice (T_l) temperatures for T_e>Θ _Debye. Moreover, we numerically solved the Two-Temperature Model. We found: (i) a T_e decay with a 3.5 ps time constant and no significant change in T_l; (ii) an e-ph coupling factor of 2 × 10 ¹⁶ 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.

Original language	English
Article number	043110
Journal	Applied Physics Letters
Volume	103
Issue number	4
DOIs	https://doi.org/10.1063/1.4816055
State	Published - Jul 22 2013

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Chatzakis, I. (2013). Electron temperature dependence of the electron-phonon coupling strength in double-wall carbon nanotubes. Applied Physics Letters, 103(4), [043110]. https://doi.org/10.1063/1.4816055

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abstract = "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>Θ Debye. 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 × 10 16 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.",

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