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NEWS

Dr. Emanuel Alves de Lima Henn

Physics Institute of Stuttgart University

Thursday, October 13th, 2011 at 03:00:00 PM

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 04:55:06 PM on Tuesday, October 4th, 2011

Stability diagram of a dipolar Bose-Einstein condensate in an optical lattice

Investigating the stability threshold of a dipolar Bose-Einstein Condensate in an optical lattice, we show how the dipolar interaction can stabilize it.

In this talk I will show the recent results of the Chromium BEC experiment in Stuttgart.

We experimentally investigate the stability threshold of a dipolar Bose-Einstein Condensate in an optical lattice as a function of the lattice depth. We show that the dipolar interaction can stabilize otherwise unstable many-body systems like a highly attractive Bose gas. When the cigar-shaped BEC is loaded in a shallow lattice, the destabilization character of the dipolar interaction takes over. For deep lattice depths, the repulsive dipolar on-site interaction balances negative scattering lengths up to -17 Bohr radii and stabilizes the chromium Bose-Einstein condensate. We probe the full cross-over between the two regimes and our results are in excellent agreement with theoretical calculations, which reveal significant dipolar inter-site interactions.

For further informations, please contact Giacomo Roati.