Naylor B, Brewczyk M, Gajda M, Gorceix O, Maréchal E, Vernac L, Laburthe-Tolra B
Université Paris 13, Sorbonne Paris Cité, Laboratoire de Physique des Lasers, F-93430 Villetaneuse, France.
CNRS, UMR 7538, LPL, F-93430 Villetaneuse, France.
Phys Rev Lett. 2016 Oct 28;117(18):185302. doi: 10.1103/PhysRevLett.117.185302. Epub 2016 Oct 27.
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.
我们通过快速冷却铬多组分玻色气体来研究自旋交换碰撞对玻色 - 爱因斯坦凝聚动力学的影响。尽管存在相对较强的自旋相关相互作用，但在自旋自由度完全热化之前就达到了玻色 - 爱因斯坦凝聚的临界温度。玻色 - 爱因斯坦凝聚导致的密度增加随后引发自旋动力学，阻碍自旋激发态凝聚体的形成。然而，仍会产生小的亚稳态自旋凝聚体，并且它们表现为强烈的自旋涨落。
