Darmstadt 2008 – scientific programme

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A: Fachverband Atomphysik

A 1: Attosecond electron dynamics

A 1.3: Talk

Monday, March 10, 2008, 14:45–15:00, 3C

Composite quantum-mechanical and quasiclassical descriptions: Application to attosecond dynamics — •Ulrich Galster and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Dresden

The emergence of attosecond laser pulses challenges theoreticians to describe electronic dynamics in the time-domain. Pure quantum mechanical long time propagation in multiple dimensions still suffer from enormous computational requirements. Quasiclassical methods are more feasible in terms of computational effort, but often fail to describe quantum effects accurately. A worthwhile alternative is to use the advantages of both descriptions in a composition. Short time-intervals which exhibit dynamics of dominant quantum character can be described quantum-mechanically, while for the remaining time a quasiclassical method is used. At the moment of switching between both descriptions, the instantaneous quantum state is transformed into a quasi-classical phase-space distribution using the Wigner function.