论文标题
低能集体振荡和bogoliubov声音
Low-energy collective oscillations and Bogoliubov sound in an exciton-polariton condensate
论文作者
论文摘要
我们报告了在圆形“盒子”陷阱中观察到振动孔冷凝物的低能，低摩米达集体振荡。振荡由偶极子和呼吸模式支配，两种模式的频率与弱相互作用的二维捕获的玻色气体的比率是一致的。从偶极子振荡频率中提取的声速小于Bogoliubov声音，这可以通过不一致的储层的影响来部分解释。这些结果为理解储层，耗散，能量弛豫和有限温度对激子 - 帕利顿冷凝物和其他二维开放式降水量子流体的超流体特性的影响铺平了道路。
We report the observation of low-energy, low-momenta collective oscillations of an excitonpolariton condensate in a round "box" trap. The oscillations are dominated by the dipole and breathing modes, and the ratio of the frequencies of the two modes is consistent with that of a weakly interacting two-dimensional trapped Bose gas. The speed of sound extracted from the dipole oscillation frequency is smaller than the Bogoliubov sound, which can be partly explained by the influence of the incoherent reservoir. These results pave the way for understanding the effects of reservoir, dissipation, energy relaxation, and finite temperature on the superfluid properties of exciton-polariton condensates and other two-dimensional open-dissipative quantum fluids.
