Physics – Quantum Physics
Scientific paper
2010-05-10
New J. Phys. 12 083053 (2010)
Physics
Quantum Physics
Scientific paper
10.1088/1367-2630/12/8/083053
Light beams carrying orbital angular momentum, such as Laguerre-Gaussian beams, give rise to the violation of the standard dipolar selection rules during the interaction with matter yielding, in general, an exchange of angular momentum larger than hbar per absorbed photon. By means of ab initio 3D numerical simulations, we investigate in detail the interaction of a hydrogen atom with intense Gaussian and Laguerre-Gaussian light pulses. We analyze the dependence of the angular momentum exchange with the polarization, the orbital angular momentum, and the carrier-envelope phase of light, as well as with the relative position between the atom and the light vortex. In addition, a quantum-trajectory approach based on the de Broglie-Bohm formulation of quantum mechanics is used to gain physical insight into the absorption of angular momentum by the hydrogen atom.
Benseny Albert
Calvo Gabriel F.
de Aldana Javier R. Vazquez
Mompart Jordi
Picón Antonio
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