2009/10/15 by Tomoyuki Horikiri, Paolo Schwendimann, P. Schwendimann +8 · 1 citation
Engineering · Physics and Astronomy · #Atomic physics #Coherence (philosophical gambling strategy) #Coherence length #Coherence time #Coherent states #Condensed matter physics #Degree of coherence #Exciton #Order (exchange) #Photon #Physics #Plasmonic and Surface Plasmon Research #Polariton #Quantum #Quantum mechanics #Strong Light-Matter Interactions #Thermal Radiation and Cooling Technologies #cond-mat.mes-hall #cond-mat.other
paper · pdf · doi:10.1103/physrevb.81.033307
4 pages, 4 figures
arxiv created 2009/10/15 · openalex publication_date 2010/01/25 · arxiv updated 2015/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The second- and third-order coherence functions g(n)(0) (n=2 and 3) of an exciton-polariton condensate are measured and compared to the theory. Contrary to an ideal photon laser, deviation from unity in the second- and third-order coherence functions is observed, thus showing a bunching effect, but not the characteristics of a standard thermal state with g(n)(0)=n!. The increase in bunching with the order of the coherence function, g(3)(0)>g(2)(0)>1, indicates that the polariton condensate is different from a coherent state, a number state, or a thermal state. The measurement of third-order coherence has the advantage, compared to the second-order one, that the difference between a thermal state and a coherent state is more pronounced. The experimental results are in agreement with the theoretical model where polariton-polariton and polariton-phonon interactions are responsible for the loss of temporal coherence.