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O: Oberflächenphysik

O 21: Phase transitions

O 21.6: Talk

Tuesday, March 28, 2006, 12:30–12:45, WIL C207

Dynamics of electrons in a Mott insulator — •luca perfetti — Freie Universität Berlin, Arnimallee 14, D-14195 Berlin

We monitor the photoelectrons emitted by a Mott insulator after the absorption of an intense laser pulse. This experiment allows to visualize directly the ultrafast melting of the insulating phase and the coherent excitation of a coupled phonon mode. The Mott phase is fully restored after 1 ps but a coherently excited phonon induces electronic oscillations lasting longer than 20 ps. As a consequence, the effects of electron-electron and electron-phonon interactions can be clearly disentangled.