Department of Physics, Centre for Quantum Information and Quantum Control, and Institute for Optical Sciences, University of Toronto, Toronto, Ontario M5S 1A7, Canada.
Phys Rev Lett. 2012 Jul 20;109(3):033605. doi: 10.1103/PhysRevLett.109.033605. Epub 2012 Jul 19.
We present experimental observations of a nonresonant dynamic Stark shift in strongly coupled microcavity quantum well exciton polaritons--a system which provides a rich variety of solid-state collective phenomena. The Stark effect is demonstrated in a GaAs/AlGaAs system at 10 K by femtosecond pump-probe measurements, with the blueshift approaching the meV scale for a pump fluence of 2 mJ cm(-2) and 50 meV red detuning, in good agreement with theory. The energy level structure of the strongly coupled polariton Rabi doublet remains unaffected by the blueshift. The demonstrated effect should allow generation of ultrafast density-independent potentials and imprinting well-defined phase profiles on polariton condensates, providing a powerful tool for manipulation of these condensates, similar to dipole potentials in cold-atom systems.
我们展示了在强耦合微腔量子阱激子极化激元中观察到的非共振动态斯塔克位移的实验结果-这一系统提供了丰富的固态集体现象。在 GaAs/AlGaAs 系统中，通过飞秒泵浦探测测量，在 10 K 下演示了斯塔克效应，对于 2 mJ/cm²的泵浦通量和 50 meV 的红失谐，蓝移接近 meV 量级，与理论吻合较好。强耦合极化激元拉比双峰的能级结构不受蓝移影响。所演示的效应应该允许产生超快的、与密度无关的势，并在极化激元凝聚物上印上明确的相位分布，为操纵这些凝聚物提供了一个强大的工具，类似于冷原子系统中的偶极势。
