Abstract
We have investigated the photoluminescence (PL) properties in a CuBr microcavity with HfO2/SiO2 distributed Bragg reflectors at 10 K from the viewpoint of cavity-polariton condensation. From the excitation-power dependence of PL spectra detected at an in-plane wave vector of k||=0, we found that the PL characteristics of the lower polariton branch markedly change with a threshold nature: a drastic increase (decrease) in the intensity (band width). In addition, the PL energy exhibits a large blueshift, ∼10 meV, around the threshold excitation power, reflecting strong polariton-polariton interactions. The blueshifted PL energy is far below the bottom energy of the cavity photon. In addition, the estimated density of photogenerated electron-hole pairs at the threshold excitation power is two orders lower than the Mott-transition density for the formation of electron-hole plasma. The above results consistently demonstrate the occurrence of the cavity-polariton condensation.
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