How do spins interact coherently with ultrashort laser pulses ?

Details How do spins interact coherently with ultrashort laser pulses ? How do spins interact coherently with ultrashort laser pulses ?

2011-12-30

arxiv.org/abs/1201.0166v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, submitted to Physical Review Letters on November 7th 2011

Scientific paper

We investigate the interaction of femtosecond laser pulses with spins including relativistic corrections. The time-ordered magneto-optical signals corresponding to a pump-probe configuration are calculated in the case of one electron submitted to a magnetic field and evolving in eight levels of the fine structure of a hydrogen-like atom. Our simulations explain the origin of the coherent magneto-optical response and ultrafast spin dynamics in ferromagnets excited by intense laser pulses as recently reported in Ni and CoPt3 ferromagnetic thin films. Our detailed analysis allows identifying the respective roles of the coherent spin-photon interaction and spin dynamics unraveling recent controversies about the laser induced ultrafast magnetization dynamics.

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