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Soutenance de stage - IM2NP

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Comparaison atom./élas. II<br />

L=∭<br />

V<br />

[ 1 2 2 u i 2 − 1 2 C ijkl<br />

2 u i<br />

∑<br />

jkl<br />

C ijkl<br />

­ Pour les 3 mo<strong>de</strong>s: ω x taille n'est pas<br />

constant<br />

­ Peut etre du à la déformation, la<br />

relaxation <strong>de</strong> surface, <strong>de</strong>s effets<br />

anharmoniques.<br />

∂u i<br />

∂u k<br />

] ∂ x j ∂ x dV<br />

l<br />

∂ 2 u k<br />

∂ x j<br />

∂ x l<br />

=0<br />

­ Effet <strong>de</strong> la déformation Dépend du<br />

mo<strong>de</strong>, mais il faudrait faire <strong>de</strong>s tailles > 4<br />

nm (5000 atomes) pour conclure.

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