Volume 81, Number 2, January 2008
Article Number 24002
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
Published online 07 December 2007
EPL, 81 (2008) 24002
DOI: 10.1209/0295-5075/81/24002

Correlation of diffusing photons and level crossing spectroscopy

E. 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.

© EPLA 2008