Correlation of diffusing photons and level crossing spectroscopyE. Akkermans and O. Assaf
Department of Physics, Technion Israel Institute of Technology - 32000 Haifa, Israel
received 26 April 2007; accepted in final form 16 November 2007; published January 2008
published online 7 December 2007
We show that an enhanced intensity correlation shows up in the diffusion of photons multiply scattered by an atomic gas of large optical depth b. This enhancement occurs only for scattering atoms that are Zeeman degenerate and it leads to a deviation from the Rayleigh law. The fluctuations measured by their variance, display a resonance peak as a function of an applied magnetic field. The resonance width is proportional to the small factor 1/b. We derive closed analytic expressions for all these physical quantities which are directly accessible experimentally.
42.50.Fx - Cooperative phenomena in quantum optical systems.
42.25.Dd - Wave propagation in random media.
71.27.+a - Strongly correlated electron systems; heavy fermions.
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