2023/08/09 by Hassan Alnatah, Alnatah, Hassan, Qi Yao +19 · 2 citations
Computer Science · Physics and Astronomy · #Quantum Electrodynamics and Casimir Effect #Quantum Information and Cryptography #Strong Light-Matter Interactions #cond-mat.quant-gas
paper · pdf · doi:10.48550/arxiv.2308.05100
arxiv created 2024/04/12 · arxiv updated 2026/08/04
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. This power law has not been predicted by prior analytical theories.