Observation of bound and antibound states of cavity polariton pairs in a CuCl microcavity
Observation of bound and antibound states of cavity polariton pairs in a CuCl microcavity
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CuCl 微腔中腔极化子对的束缚态和反束缚态的观察
DOI：
10.1103/physrevb.89.035317
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and H. Ishihara
中科院分区：
文献类型：
--
作者：
S. Matsuura;Y. Mitsumori;H. Kosaka;K. Edamatsu;K. Miyazaki;D. Kim;M. Nakayama;G. Oohata;H. Oka;H. Ajiki;and H. Ishihara
我们用光谱分辨的四波混频方法观察了平面CuCl微腔中腔极化子对的反束缚态和束缚态。通过改变空腔失谐所对应的泵浦脉冲入射角，得到了束缚态和反束缚态的色散曲线。束缚态的色散曲线表明束缚态主要由裸双激子组成，并且与腔光子弱耦合。束缚态的消相时间比薄样品中裸双激子的消相时间快，支持了束缚态与腔光子耦合的假设。另一方面，反束缚态由两个具有相同自旋的低极化子组成。反束缚态的清晰观察可以定性地解释为相空间填充，它减少了拉比分裂。
We observed the antibound state, as well as the bound state, for cavity polariton pairs in a planar CuCl microcavity by spectrally resolved four-wave mixing. We obtained dispersion curves of the bound and antibound states by changing the incident angle of the pump pulses corresponding to the cavity detuning. The dispersion curve for the bound state suggests that the bound state is mainly composed of a bare biexciton and is weakly coupled to the cavity photons. The dephasing time of the bound state was faster than that of a bare biexciton in a thin sample, supporting the hypothesis that the bound state is coupled to the cavity photons. On the other hand, the antibound state consists of two lower polaritons having the same spin. The clear observation of the antibound state can be qualitatively explained by the phase-space filling, which reduces the Rabi splitting.