Observation of diffusive and dispersive profiles of the nonequilibrium polariton-condensate dispersion relation in a CuBr microcavity

Article

关键词: BOSE-EINSTEIN CONDENSATION;    EXCITON POLARITONS;   

DOI  :  10.1103/PhysRevB.95.125315

来源: SCIE

【 摘 要 】

We have investigated the dispersion relation of polariton condensates in a CuBr microcavity with the use of angle-resolved photoluminescence (PL) spectroscopy at 77 K. The polariton condensation was clearly confirmed by the thresholdlike changes in the PL intensity, energy, and bandwidth of the lower polariton at a zero in-plane wave-vector k(vertical bar vertical bar) = 0 as a function of excitation power density. A blueshifted flat dispersion of the PL energy suddenly appeared at the condensation threshold in a small k(broken vertical bar broken vertical bar) region accompanied by the dispersion of the noncondensate PL as a background. With increasing excitation power density from the threshold, the intensity of the noncondensate PL became negligible. As a result, we found a dispersive profile of the dispersion relation of the condensate in a large k(vertical bar vertical bar) region in addition to the flat dispersion corresponding to the diffusive profile. The total dispersion relation of the condensate was explained quantitatively by a theoretical model for nonequilibrium condensation.

【 授权许可】

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