Magnetic Field Enhanced Coherence Length in Cold Atomic Gases

Details Magnetic Field Enhanced Coherence Length in Cold Atomic Gases Magnetic Field Enhanced Coherence Length in Cold Atomic Gases

2004-01-23

arxiv.org/abs/cond-mat/0401455v2

Physical Review Letters 93 (2004) 143906

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.93.143906

We study the effect of an external magnetic field on coherent backscattering of light from a cool rubidium vapor. We observe that the backscattering enhancement factor can be {\it increased} with $B$. This surprising behavior shows that the coherence length of the system can be increased by applying a magnetic field, in sharp contrast with ususal situations. This is mainly due to the lifting of the degeneracy between Zeeman sublevels. We find good agreement between our experimental data and a full Monte-Carlosimulation, taking into account the magneto-optical effects and the geometry of the atomic cloud.

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