Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.163003
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Funding
- IDEX PSL [ANR-10-IDEX-0001-02 PSL]
- ANR [ANR-13-BS04-0003-01]
- Labex First-TF
- Agence Nationale de la Recherche (ANR) [ANR-13-BS04-0003] Funding Source: Agence Nationale de la Recherche (ANR)
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We perform Ramsey interferometry on an ultracold Rb-87 ensemble confined in an optical dipole trap. We use a pi pulse set at the middle of the interferometer to restore the coherence of the spin ensemble by canceling out phase inhomogeneities and creating a spin echo in the contrast. However, for high atomic densities, we observe the opposite behavior: the pi pulse accelerates the dephasing of the spin ensemble leading to a faster contrast decay of the interferometer. We understand this phenomenon as a competition between the spin-echo technique and an exchange-interaction driven spin self-rephasing mechanism based on the identical spin rotation effect. Our experimental data are well reproduced by a numerical model.
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