Świsłocki Tomasz, Witkowska Emilia, Dziarmaga Jacek, Matuszewski Michał
Instytut Fizyki PAN, Aleja Lotników 32/46, 02-668 Warsaw, Poland.
Instytut Fizyki Uniwersytetu Jagiellońskiego, ul. Reymonta 4, 30-059 Kraków, Poland.
Phys Rev Lett. 2013 Jan 25;110(4):045303. doi: 10.1103/PhysRevLett.110.045303. Epub 2013 Jan 24.
We consider a phase transition from an antiferromagnetic to a phase separated ground state in a spin-1 Bose-Einstein condensate of ultracold atoms. We demonstrate the occurrence of two scaling laws, for the number of spin domain seeds just after the phase transition, and for the number of spin domains in the final, stable configuration. Only the first scaling can be explained by the standard Kibble-Żurek mechanism. We explain the occurrence of two scaling laws by a model including postselection of spin domains due to the conservation of condensate magnetization.
我们考虑在超冷原子的自旋-1玻色-爱因斯坦凝聚体中从反铁磁到相分离基态的相变。我们证明了在相变刚结束时自旋畴种子数量以及最终稳定构型中自旋畴数量的两种标度律的出现。只有第一种标度律可以用标准的基布尔-祖雷克机制来解释。我们通过一个包含由于凝聚体磁化守恒而对自旋畴进行后选择的模型来解释两种标度律的出现。
