电子-空穴双层膜中的激子玻色极子

E. A. Szwed, B. Vermilyea, D. J. Choksy, Zhiwen Zhou, M. M. Fogler, L. V. Butov, D. K. Efimkin, K. W. Baldwin, L. N. Pfeiffer
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引用次数: 0

摘要

玻色极子是由周围变性玻色气体的密度波动包裹的移动杂质。这些多体物体已在超冷原子气体中实现,并成为深入研究的主题。我们发现,玻色极子是由沉浸在空间间接激子(IXs)的退化玻色气体中的空间直接激子形成的。我们通过测量光致发光激发光谱检测到了吸引性和排斥性玻色极子。我们通过光激发来控制 IX 玻色气体的密度,并观察到随着 IX 密度的增加,吸引性和排斥性玻色极子之间的能量分裂增强,这与我们的理论计算结果一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Excitonic Bose-polarons in electron-hole bilayers
Bose polarons are mobile impurities dressed by density fluctuations of a surrounding degenerate Bose gas. These many-body objects have been realized in ultracold atomic gasses and become a subject of intensive studies. In this work, we show that excitons in electron-hole bilayers offer new opportunities for exploring polarons in strongly interacting, highly tunable bosonic systems. We found that Bose polarons are formed by spatially direct excitons immersed in degenerate Bose gases of spatially indirect excitons (IXs). We detected both attractive and repulsive Bose polarons by measuring photoluminescence excitation spectra. We controlled the density of IX Bose gas by optical excitation and observed an enhancement of the energy splitting between attractive and repulsive Bose polarons with increasing IX density, in agreement with our theoretical calculations.
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