Quantum Signatures in Strong Field Physics
The interaction of atoms with super intense electromagnetic fields has shown to give rise to the emergence of high harmonics.1 Many aspect of this interaction have been explained satisfactorily with purely classical models while others have required a. quantum mechanical treatment of the atom. We investigate the dynamics of these strong field processes more quantitatively by comparing the time dependent Wigner functions with classical Monte Carlo distributions. In particular negativities in the Wigner function will give us a. clear indication for the existence of quantum mechanical behaviour. In an earlier attempt Bestle, Akulin and Schleicli2 have employed a phase space description of the stabilization process in which they concentrated on two dynamic regimes of the system: For a sudden turn-on of the field they predict classical stabilization while for ari adiabatic turn-on the origin of the process is of a purely quantum nature. We here investigate a regime which shows an interesting interplay of both classical and quantum behaviour.
KeywordsWigner Function Dynamic Regime Classical Calculation Quantum Signature Classical Stabilization
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- 1.for reviews of this field see e.g. A L’Huillier, L A Lompre, G Mainfray and C Manus, Advances in Atomic, Molecular and Optical Physics, ed. by M Gavrila. (Academic Press, New York, 1992); M Gavrila. (Ed), “Atorns in Intense Laser Fields”, (Academic Press, Boston, 1992); K Burnett, V C Reed, P L Knight, J. Phys. B 26, 561 (1993).Google Scholar
- 2.J Bestle, V A Akulin and W P Schleich, Phys.Rev. A48, 716 (1993).Google Scholar