Coherence measurements of polaritons in thermal equilibrium reveal a power law for two-dimensional condensates.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38701210.
- Also identified by DOI 10.1126/sciadv.adk6960 and PMC identifier 13108737.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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.