电调谐纳米腔中量子点激子极化激元的退相
Dephasing of quantum dot exciton polaritons in electrically tunable nanocavities
摘要：
我们从理论和实验上研究了电调谐单点光子晶体纳米腔中零维微腔极化激元的退相。这样的设备允许我们改变点腔失谐在原位和直接探测上的发射光谱的变化的非相干激发能级和晶格温度的影响。通过与理论计算结果的比较，我们得到了极化激元退相速率，并阐明了它与光激发功率和晶格温度的关系。对于低激发水平，我们观察到一个线性的温度依赖性，声子介导的极化激元退相。在较高的激发水平下，由于与固态环境的耦合，观察到激发诱导的失相。这些结果为研究量子点微腔极化激元的相干特性提供了新的信息。
英文摘要：
We experimentally and theoretically investigate dephasing of zero dimensional microcavity polaritons in electrically tunable single dot photonic crystal nanocavities. Such devices allow us to alter the dot-cavity detuning in-situ and to directly probe the influence on the emission spectrum of varying the incoherent excitation level and the lattice temperature. By comparing our results with theory we obtain the polariton dephasing rate and clarify its dependence on optical excitation power and lattice temperature. For low excitation levels we observe a linear temperature dependence, indicative of phonon mediated polariton dephasing. At higher excitation levels, excitation induced dephasing is observed due to coupling to the solid-state environment. The results provide new information on coherence properties of quantum dot microcavity polaritons.
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