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Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 65: Quantum gases: Bosons III

Q 65.3: Talk

Friday, March 22, 2013, 14:45–15:00, F 342

Density correlation of a mixture of ultracold atoms in an optical lattice — •Vladislav Gavryusev1,2,3, Stefano Conclave1,2, Giacomo Lamporesi1,2, Devang Naik1,2, Francesco Minardi1,2, and Massimo Inguscio1,21LENS-European Laboratory for Non-Linear Spectroscopy and Dipartimento di Fisica, Universitá di Firenze, via N. Carrara 1, IT-50019 Sesto Fiorentino-Firenze, Italy — 2CNR-INO, via G. Sansone 1, IT-50019 Sesto Fiorentino-Firenze, Italy — 3Physikalisches Institut, Universitatät Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany

At LENS we have an experimental apparatus that can produce a double Bose-Einstein condensate of 87Rb and 41K atoms and trap it in a 3D optical lattice. The atomic sample is well described by the double species Bose-Hubbard model and its parameters can be experimentally controlled with great precision by varying the power of the trapping laser and by applying magnetic fields. We are interested in the arrangement of the atoms in the lattice and for this we require diagnostic methods that can access the relevant observables. We make use of the Hanbury Brown and Twiss effect, which, if there is a regular ordering of the atoms in the lattice, leads to the presence of a correlation in the fluctuations of the atomic density, caused by the quantum statistics of bosonic particles. Different orderings lead to different correlation patterns, allowing to discriminate ”ferromagnetic” and ”antiferromagnetic” phases. We validated our technique by studying the single species case and now we are making progress on applying this method to the double species case.

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