论文标题
极性子的量子流体的集体激发谱
Spectrum of collective excitations of a quantum fluid of polaritons
论文作者
论文摘要
我们使用最近开发的高分辨率相干探针光谱法来研究极化量子流体的集体激发的分散。我们与高能量和波数分辨率测量分散关系，这使我们能够确定流体中的声音速度，并证明激子储层的贡献。我们在分散曲线的幽灵分支上报告了负能量的集体激励产生。还确定了动态不稳定性的前体。我们的方法为光的量子流体的量子水动力学的精确研究开辟了道路。
We use a recently developed high-resolution coherent probe spectroscopy method to investigate the dispersion of collective excitations of a polaritonic quantum fluid. We measure the dispersion relation with high energy and wavenumber resolution, which allows us to determine the speed of sound in the fluid and to evidence the contribution of an excitonic reservoir. We report on the generation of collective excitations at negative energies, on the ghost branch of the dispersion curve. Precursors of dynamical instabilities are also identified. Our methods open the way to the precise study of quantum hydrodynamics of quantum fluids of light.
