Plasmon signatures in high harmonic generation

Details Plasmon signatures in high harmonic generation Plasmon signatures in high harmonic generation

2005-05-24

arxiv.org/abs/quant-ph/0505184v3

Physics

Quantum Physics

Major revision, 12 pages, 5 figures, submitted to J. Phys. B (2005), accepted

Scientific paper

10.1088/0953-4075/39/3/022

High harmonic generation in polarizable multi-electron systems is investigated in the framework of multi-configuration time-dependent Hartree-Fock. The harmonic spectra exhibit two cut offs. The first cut off is in agreement with the well established, single active electron cut off law. The second cut off presents a signature of multi-electron dynamics. The strong laser field excites non-linear plasmon oscillations. Electrons that are ionized from one of the multi-plasmon states and recombine to the ground state gain additional energy, thereby creating the second plateau.

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