Low-Energy Collective Oscillations and Bogoliubov Sound in an Exciton-Polariton Condensate
Low-Energy Collective Oscillations and Bogoliubov Sound in an Exciton-Polariton Condensate
复制标题
激子-极化子凝聚体中的低能集体振荡和博戈留波夫声
DOI：
10.1103/physrevlett.126.075301
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发表时间：
2021
影响因子：
8.6
通讯作者：
Ostrovskaya, E. A.
中科院分区：
文献类型：
--
作者：
Estrecho, E.;Pieczarka, M.;Wurdack, M.;Steger, M.;West, K.;Pfeiffer, L. N.;Snoke, D. W.;Truscott, A. G.;Ostrovskaya, E. A.
本文报道了在圆“盒”阱中观察到的激子-极化激元凝聚体的低能、低动量集体振荡。振荡主要由偶极子和呼吸模式，和两个模式的频率的比例是一致的弱相互作用的二维囚禁玻色气体。从偶极子振荡频率提取的声速小于Bogoliubov声音，这可以部分地解释为非相干水库的影响。这些结果为理解储集层、耗散、能量弛豫和有限温度对激子-极化激元凝聚体和其他二维开放耗散量子流体的超流性质的影响铺平了道路。
We report the observation of low-energy, low-momenta collective oscillations of an exciton-polariton 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.