Competition between Bose-Einstein Condensation and Spin Dynamics.
We study the impact of spin-exchange collisions on the dynamics of Bose-Einstein condensation by rapidly cooling a chromium multicomponent Bose gas. Despite relatively strong spin-dependent interactions, the critical temperature for Bose-Einstein condensation is reached before the spin degrees of freedom fully thermalize. The increase in density due to Bose-Einstein condensation then triggers spin dynamics, hampering the formation of condensates in spin-excited states. Small metastable spinor condensates are, nevertheless, produced, and they manifest in strong spin fluctuations.
Université Paris 13, Sorbonne Paris Cité, Laboratoire de Physique des Lasers, F-93430 Villetaneuse, France.|CNRS, UMR 7538, LPL, F-93430 Villetaneuse, France.
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Naylor
Wydział Fizyki, Uniwersytet w Białymstoku, ul. K. Ciołkowskiego 1L, PL-15-245 Białystok, Poland.
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Brewczyk
Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, PL-02668 Warsaw, Poland.
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Gajda
Université Paris 13, Sorbonne Paris Cité, Laboratoire de Physique des Lasers, F-93430 Villetaneuse, France.|CNRS, UMR 7538, LPL, F-93430 Villetaneuse, France.
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Gorceix
Université Paris 13, Sorbonne Paris Cité, Laboratoire de Physique des Lasers, F-93430 Villetaneuse, France.|CNRS, UMR 7538, LPL, F-93430 Villetaneuse, France.
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Maréchal
Université Paris 13, Sorbonne Paris Cité, Laboratoire de Physique des Lasers, F-93430 Villetaneuse, France.|CNRS, UMR 7538, LPL, F-93430 Villetaneuse, France.
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Vernac
Université Paris 13, Sorbonne Paris Cité, Laboratoire de Physique des Lasers, F-93430 Villetaneuse, France.|CNRS, UMR 7538, LPL, F-93430 Villetaneuse, France.
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Laburthe-Tolra