Alnatah Hassan, Yao Qi, Beaumariage Jonathan, Mukherjee Shouvik, Tam Man Chun, Wasilewski Zbigniew, West Ken, Baldwin Kirk, Pfeiffer Loren N, Snoke David W
Department of Physics, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, PA 15218, USA.
Joint Quantum Institute, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA.
Sci Adv. 2024 May 3;10(18):eadk6960. doi: 10.1126/sciadv.adk6960.
We have created a spatially homogeneous polariton condensate in thermal equilibrium, up to very high condensate fraction. Under these conditions, we have measured the coherence as a function of momentum and determined the total coherent fraction of this boson system from very low density up to density well above the condensation transition. These measurements reveal a consistent power law for the coherent fraction as a function of the total density over nearly three orders of its magnitude. The same power law is seen in numerical simulations solving the two-dimensional Gross-Pitaevskii equation for the equilibrium coherence.
我们在热平衡状态下创建了一种空间均匀的极化激元凝聚体，其凝聚分数非常高。在这些条件下，我们测量了作为动量函数的相干性，并确定了这个玻色子系统从非常低的密度到远高于凝聚转变密度的总相干分数。这些测量揭示了相干分数作为总密度函数在近三个数量级上的一致幂律。在求解二维格罗斯 - 皮塔耶夫斯基方程以获得平衡相干性的数值模拟中也观察到了相同的幂律。
