Research in coherent collective excitation states of semiconductor quantum dots in 1-D micro-cavity cavity.

研究了(λ/4)HfO_2/(λ/4)SiO_2分布布拉格反射器中CuCl量子点的腔偏振特性。该微腔的上下极化子模之间有很大的分裂，估计为160 meV。通过对腔内极化子角度的分析，估算出微腔中CuCL量子点的激子振荡器强度是纯CuCL量子点激子振荡力的40倍。在较高激发密度下，自由激子发光呈现超线性关系，在3.17 eV处突然出现新的发光带。这些结果表明，在一维微腔中产生了相干集体激发态。

We have investigated cavity polariton properties of CuCl quantum dots in (λ/4) HfO_2/(λ/4) SiO_2 distributed Bragg reflectors. This micro-cavity has very large splitting between upper and lower polariton modes, which is estimated to be 160 meV. From the analysis of angle dependence of the cavity polaritons, it is estimated that the oscillatorstrength of exciton of CuCl quantum dots in the micro-cavity is larger 40 times than that of only CuCl quantum dots. Under the higher excitation density, the free exciton luminescence shows super-linear dependence and new luminescence band appears abruptly at 3.17eV. These results suggest the generation of the coherently collective excitation states in 1-D micro-cavity.