book of abstracts - IM2NP

A B S T R A C T S FRIDAY, JULY 2 N A N O S E A 2 0 1 0
thickness of the CNTs resulting film. Besides, we show that these two parameters are fundamental to tune
the photoconversion efficiency of CNTs/Si heterostructures.
References
1) E. Kymakis, G. A. J. Amaratunga, Appl. Phys. Lett. 80 (2002) 112.
2) J. Arranz-Andres, W. J. Blau, Carbon, 46 (2008) 2067.
3) Y. Jia, J. Wei, K. Wang, A. Cao, Q. Shu, X. Gui, Y. Zhu, D. Zhuang, G. Zhang, B. Ma, L. Wang, W. Liu, Z. Wang, J. Luo, D. Wu, Adv.
Mater. 20 (2008) 4594.
4) Z. Li, V. P. Kunets, V. Saini, Y. Xu, E. Dervishi, G. J. Salamo, A. R. Biris, A. S. Biris, ACSNano, 3 (2009) 1407
5) P. Castrucci, C.Scilletta, S. Del Gobbo, M. Scarselli, M. Simeoni, B. Delley, A. Continenza and M. De Crescenzi, to be published
9H30-9H50
Many Body Shake Up in Core-Valence-Valence Electron Emission from Single
Wall Carbon Nanotubes.
A. Sindona, M. Pisarra, A. Bonanno, A. Cupolillo, P. Riccardi, G. Falcone
(DIPARTIMENTO DI FISICA, UNIVERSITA‟ DELLA CALABRIA and INFN, Gruppo Collegato di COSENZA,
VIA P: BUCCI, CUBO 31C, 87036 RENDE (CS), ITALY). antonello.sindona@fis.unical.it;
michelepisarra@yahoo.it
1 – Introduction.
Fig. 1: Experimental derivative of the Kinetic energy distribution of
electrons ejected from bundles of SWNCTs via Auger CVV (circles);
corrected distribution after Shirley background subtraction (dots);
theoretical distribution calculated from the model presented here
(continuous line).
Auger processes are of crucial importance in
understanding the electronic properties of both
solid state and biological samples. In materials
with a band structure, the creation of a core-hole
lead to core-valence-valence (CVV) Auger
electron emission, where the initially empty core
level causes a decay that involves two valence
electrons: one neutralizing the core-hole and the
other being ejected [1,2]. A fundamental role is
played by the broadening of the Auger peak that
contains information on a variety of effects, such
as the finite lifetime of initial and final states, the
electron-phonon interaction, and the many-body
shake up of Fermi electrons, which are spectator to
the CVV transition [3,4]. Some attempts have been
made to apply these concepts in interpreting the
Auger spectra of Carbon based and Carbon
nanostructured materials, although ad adequate
picture is still lacking [5]. In this paper, we present
a tight-binding model to calculate the CVV spectra
from an ideal sheet of Graphene and a cylindrical
Carbon NanoTube (CNT).
2 – Model and Application.
The Hamiltonian of a CVV process, in a CNT of specific diameter and chirality, has an unperturbed
bands and (iii) the core-hole. The perturbation V is modeled by a two-body operator, in which the (screened)
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