Optical Transition and Momentum Transfer in Atomic Wave Packets

Details Optical Transition and Momentum Transfer in Atomic Wave Packets Optical Transition and Momentum Transfer in Atomic Wave Packets

2000-11-04

arxiv.org/abs/quant-ph/0011018v1

Physics

Quantum Physics

6 pages, 10 Figures

Scientific paper

10.1103/PhysRevA.64.013416

It is shown that the population Rabi-floppings in a lossless two-level atom, interacting with a monochromatic electromagnetic field, in general are convergent in time. The well-known continuous floppings take place because the restricted choosing of initial conditions, that is when the atom initially is chosen on ground or excited level before the interaction, simultaneously having a definite value of momentum there. The convergence of Rabi-floppings in atomic wave-packet-states is a direct consequence of Doppler effect on optical transition rates (Rabi-frequencies): it gradually leads to ''irregular'' chaotic-type distributions of momentum in ground and excited energy levels, smearing the amplitudes of Rabi-floppings. Conjointly with Rabi-floppings, the coherent accumulation of momentum on each internal energy level monotonically diminishes too.

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